Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefa8c7b59ebbf5f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 01:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42c075a364357f12fa693d0ec01c7c4e SHA-1: a7792f4ad54779ac371cc0cb1a5a9331b85edec7 SHA-256: aefa8c7b59ebbf5f2d05ce11eb183e32ff69fb3ae007bf6c9eb7f24cb543fa0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://giteduguedesboires.com/userfiles/file/7781625034.pdf In PDF document text
    • http://beming.com/ressource/site-image/files/92769217336.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/27189789031.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/733a7bb71be5f8a22d735bb37003bc7e/doraguw.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/tuxolalevizavumawelovutul.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/501721340231548dde3f2133e9e4c474/powidijixebatinuni.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fatunoruwamejatagopevow.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/25555266722.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/10514991742.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bokamisazebigokulufovafu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/49681940003.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/53188809268.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/73909824458.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/fajogakezarotojaw.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/nubezavotimune.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385c58059f---doteminatobezodumufonan.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/21958869204.pdfIn PDF document text
    • http://renknh.com/ckupload/files/70038533994.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161366ffbc7dc5---14555168716.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614316d76a83c---nuvoxob.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/wurakivoxiforerove.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/sezivimi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e790196fdbc63ac528beca94e7fcda3c/tarekujedesonades.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/63745541942.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/xawukixifilumakejawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=g+switch+3+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 18568 bytes
SHA-256: 8a5a25eb91a31b320fecc34fd7d5e7d467a2c5da64ef3157acbb7446d4067eed
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10788 bytes
SHA-256: c0ffffb2243252986790fe6fdd986606bc7af2e9d9db64de49f554b05f1c6590