Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e9d637004a01e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-15 19:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e78cec3e82d70a160fce046cb7cb970 SHA-1: 07dd0b8401d7fff98a8d6ef796f3ef1f7940ee38 SHA-256: 821e9d637004a01e2bc5279e1b3fc17b2c7c47fa824c3bd363667000e966c649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often involves embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/rkckqk3mm0qrqlel8qrpvump10/17732395096.pdf In PDF document text
    • http://amoy-art.com/Upload/file/sebujebebuxolinu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4977a233b---tekewuzaxidibumokasis.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083072bb6325---nisokejegekitupala.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/koxakibokujoj.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/mupevesutewab.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d7ea6272a87b90de685ececdb382843e/sopomodejabiz.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tatasoge.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890987939aa---tasujilibawepaxa.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/vexolalu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/69217a4dd6356e49225bc5f4890997a3/31815765228.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/8be5dee8ecf8eace4ea02ee612da1958/dujevorixa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kirafupetozasiduxazepu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14701067085.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087203798c6b---vowilemofiveki.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kefufomosifimoxer.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e202ab2c9---zodevadolozuvaxiwiduxulu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hu7ube10pl4rcr1oamqf7mcqud/jubilagimufozu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jebexuveralotategilen.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/galetixemumapusizivubu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747bcb8db9---44204814144.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/dikukusutu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/paviwemerewanodemaziredoz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dfb7b677---47574119024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=extinct+species+meaningPDF 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_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16424 bytes
SHA-256: c741e6f5fa825a6807c42585922904197a542b9cb9cc6e5f9a1a9a72d2973d13
font_01_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 10536 bytes
SHA-256: c0faa18ee339389e033135db529691355ab47ed08d9d2288af79b0d64a6c3b54

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