Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d62f0bbb1f27d5…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 12:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a783503ca3444d2085f17e1cf4c1211 SHA-1: 9650f4b86a8980bea45afe42ee0ba9a2f000ade6 SHA-256: a0d62f0bbb1f27d55faad480648ced5bf117054d80c2fab74524b033d7f19a53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=introduction+to+psychology+morgan+and+king+pdf PDF link annotation
    • http://gianniarnaudo.com/userfiles/files/43958852145.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210815_014601.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lukipolovebovaxirajobul.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ba9cef2---tofutasewovowenuzewul.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc5ba8fd---44313595437.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ab14fc8e21a64fb1281b02d56d93121/kelemez.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zajodir.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a41d1a0e8---72966491670.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cde87bd38---tikajokadal.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/436e86174d4e68387a0f3ed3c5e8f10d/xuwalax.pdfIn PDF document text
    • http://newo.ru/files/files/megogurafopivaweli.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/21479239439.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95347889877.pdfIn PDF document text
    • http://praguetransfer.com/files/file/letomokakojo.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/25736684344.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/10177673650.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fdac1473---76458155258.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/fenasudidar.pdfIn PDF document text
    • https://proxus.nl/file/xajuruvomedexupikurov.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/38496245817.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vilowek.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fuforukeragalozi.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/rinuzupopoxinok.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/63364196093.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d67419b7451c66e45e6111767aefc1cc/71578423529.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/9986890182.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_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 11192 bytes
SHA-256: 4161cd8fea4ef2cef216fdb4eda69ef530310212ccda6edcb147f815518650bf
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16776 bytes
SHA-256: 7de39f938986148a042c8db9b8ebc822f33b28a0a52699f5aca6f509aa01da32

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