Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9f0f692178c457…

MALICIOUS

PDF

102.5 KB Created: 2021-07-31 22:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30e82fb92c2d353d933a7b04aa167582 SHA-1: ee08ffb6ff55d202a41fde719345e7831e147a3d SHA-256: fd9f0f692178c457e3fd64a7d91a1cb0172c317906549346f25a0632e66744f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, designed to trick users into downloading further malicious content. The presence of a download button lure reinforces this phishing attempt. Although no scripts were directly extracted, the overall structure and heuristics suggest it's a downloader or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6ba5fd54---49589941532.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160841e26af6d4---gufoj.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c1bbcd2f---lufugumelulekesekuvoxexi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610133ba87c57---18524856903.pdfIn PDF document text
    • http://scro.ru/pic/file/40064850106.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/65251518392.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/90422517343.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5959e9db4---dakiwegemigogi.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/74742131294.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/32337909526.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/85049288246.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/6368665747.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///wotutebijirutexubitufunis.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/512bb2561f225fbb45ac306fded74956/65004949409.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/4342940393.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5ea4575527932f616df161c8538820f4/xilamapatu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1b4c60e6956d7169bee0d6f673bbf48e/30638702238.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989310953d6---tenezapito.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e3fdda933f51407b243057e4dbffac00/11420804286.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/52180812545.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/88964710891.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dab3c0914f2---65036999786.pdfIn PDF document text
    • http://unityproductions.com/upload/files/79567380050.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/vexikeromalotawijoxaxude.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/16711335792.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/bekomukixu.pdfIn PDF document text
    • https://vestol.bg/files/file/98298351765.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/xorobufum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=clash+royale+private+server+apk+download+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 17356 bytes
SHA-256: 0efa4f2ba29caed8e84f1271f3c5fd95223e0bf9747fb1891164e4806241000f
font_02_sfnt_off00015abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABB 11120 bytes
SHA-256: fb29cd007598976a9902e6ff173aec8b367a76b1ef66f8976ea80fa082313d75
font_03_sfnt_off000174bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BB 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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