Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b80370cde6c678d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 03:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4d6190c1f97469253996aca56d23ec8 SHA-1: f706e8868dfe3e93fb36d885c1911be447c37f1c SHA-256: 8b80370cde6c678de9afdc89ed204c9c214880ed2f7b1477808902ff68dd45eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cheesykeju.com/contents/files/gogusiruwuwe.pdf In PDF document text
    • https://by-express.com/upfiles/editor/files/tolivulukaparekofuj.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/lojasumufonagadisakunan.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kcq9u4gcoj7qstaqnlmvmu42o4/sekosabixuwoleduxegavep.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101951138539.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/rewinazu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/nazobunoxopuxetuda.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/53186133046.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/883766435.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pavijosu.pdfIn PDF document text
    • https://bak.vn/upload/files/kinasu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427e6e390a---temobamobazubixenok.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9ad8c9f8e7f9f60586d452f0fd2e7698/telunepabojuxag.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/54850882541.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/damavuworugew.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xufowa.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/kezime.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/mowidikupuj.pdfIn PDF document text
    • http://riviera.az/userfiles/file/1281789669.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/33495197756.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/bifebizijinuz.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/469312e54ce02f85dd6f3b74d0fd30ab/35958883386.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/93592627476.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/kuxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ios+vs+android+users+worldwidePDF 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10344 bytes
SHA-256: 0270c94a09f3f46fb4f80118c934a5a88a5085d46e250b830574241489561518
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 17940 bytes
SHA-256: 832e9abecfef319e92c019c655de1b02f8cda19b80145cadf562371b8234fc1f
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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