Malicious PDF — malware analysis report

Static analysis result for SHA-256 480c67c083888545…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 16:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0e4f2d1f043b45d5dab7529655791b7 SHA-1: 3f04b9e5ce8160766016dc82f74fa385e5111163 SHA-256: 480c67c0838885452ec8bb5162216b180f369def55d8bef0f70a19ad09a343b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Analysis reveals it functions as a link farm, embedding numerous URLs that point to compromised or disposable domains. These links are likely intended to lure users to malicious websites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=phases+of+matter+review+worksheet+answers PDF link annotation
    • http://alimentosldm.com/userfiles/file/pimiseboginuja.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4jdeanfft5osrskfb4t8vthaim/wedanu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/78286182015.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210828_40589BA11499223C.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/17787637137.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/kanumaxovodevazojomud.pdfIn PDF document text
    • http://frchem.cn/upload/files/99980860566.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/93927581146.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/26724350746.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b65nd1v5f9rkv2eo7iongh1ts6/45661516724.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/ladoziweduwasatax.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69d0341f0---kusosavidexaxizeputuwegej.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/29962318267.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a471ec0cee5---1235858532.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/466349437.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd05089b1e---pezagofot.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/43709744401.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61669358501.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611c1467a0---filidetimopuwiwekazoke.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/89786a505fd566054aa2ca8a50fdd650/gekajupofufuvurarupata.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ee02cb6ec166bd5896f79b97e6cb966/2823691756.pdfIn PDF document text
    • https://angkalaris.com/contents/files/29731410042.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gexatolekug.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gitizenovumefukamej.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5afe2f7i9drdb3e6ntndinktn1/11455151742.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_off0000c076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 16664 bytes
SHA-256: f97c99fb61d66cdd5ebd4775f2a94551289386c2b88d0835f1440cb6241f4612
font_02_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10676 bytes
SHA-256: 2756e1f0c900e08f3a224a8cb01c37be1587729dc85d6cf9f625344ee79d4d71

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