Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5067aa70c6d9be3…

MALICIOUS

PDF

86.2 KB Created: 2021-10-08 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2eb7eed983b1f0be2c75ce07c74fa0f2 SHA-1: 4b82b15d4b425d950683bd123580e3d6aa8acc0c SHA-256: a5067aa70c6d9be341aef2e6027cbe139d5f7285b3e57396d6a5eb31add92b30
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to host malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://videofilm-tv.ru/content/File/21493671479.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2666cc04355d96e7cdbbd4103e2d791f/38558857310.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/37407439635.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/wisekedunepabuketit.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/4275218797.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9b331908d2b119c4f487ab38d7dfd526/24339723594.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/51467991523.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/pasutagujeneban.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210919073511.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/gusuwa.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/lofizupev.pdfIn PDF document text
    • https://bloomeng.com/uploads/xexigaxelafebarawugimajej.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/38742676404.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/79242576339.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/xulodune.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/vajotituveganiputewejapab.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3480d7eba6c94a1ef3133530070e4c10/75011411062.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/35806960041.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/1025711699.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109252051097329.pdfIn PDF document text
    • https://indian-sped.szabgab.hu/fck_uploads/pdf/lawawelu.pdfIn PDF document text
    • http://htcable.cn/d/files/wadilo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wejenisivukinekadexuboj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/244f95378b6cbe34cfc44fc743257fc2/88197182489.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/45340371876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=creamy+chicken+and+rice+soupPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/31600947739.pdfIn PDF document text
    • 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_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 10972 bytes
SHA-256: 77c46184ad91e9c0c71cad1cf6daf6b8725811b7220ab377dce3bc0c9941e592
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 20520 bytes
SHA-256: 91047663d2b8e605d8ce9d4630cc2bfa2d53752b9a8a00f4f571dcc705985293
font_02_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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