Malicious PDF — malware analysis report

Static analysis result for SHA-256 66769f2c4f8420c3…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 06:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b739f43631170de3ea8d55bab26c11e SHA-1: 6fc444ae8f9232a50b781859a9d8181dc55b114f SHA-256: 66769f2c4f8420c3ec121ed3196605930d75829440e16241f66a99a346df6d1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, likely aiming to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the nature of the URLs and the ML detection indicate a high likelihood of malicious intent, possibly involving a drive-by download or a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pistant.ru/uplcv?utm_term=best+verizon+wireless+discount PDF link annotation
    • https://castilloexterior.org/ckfinder/userfiles/files/65688172937.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/95895459770.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eaa42b56d---pezoviribapejekabijuwuviw.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/duzewi.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/rifumes.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210910192939.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/77505758696.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/xejebanisidemebuluribex.pdfIn PDF document text
    • http://videocycling.info/files/file/bazogun.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210906192623.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/78676858740.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/20500343077.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/67302291638.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fuxez.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133dca301672---17772365726.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/sebeto.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a500b266e---63354314747.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed060ea959---pumuladefabisuj.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/55562546500.pdfIn PDF document text
    • http://lulanjina.net/upload/files/59456992600.pdfIn PDF document text
    • http://partnercable.hu/files/20865525328.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/59353210075.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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 18212 bytes
SHA-256: fc56e24a87fad23421ff9d3179e712524c763801821201b2b2b6c9a1e3f4b55f
font_01_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 10564 bytes
SHA-256: 661103cb5ad5775177474823703df0719a089783a7fdd364bae143565694e6a0

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