Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3c21b051ea8cae…

MALICIOUS

PDF

92.2 KB Created: 2021-08-11 09:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a99d3479e6af34e883804e918185291 SHA-1: 5e2760cf4a91ef10546cba4e57a4a0ead961ccfd SHA-256: 8d3c21b051ea8cae2e77b935daab268ccdfaa15eca22016e9c0fd9f2dc029f9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://mama-care.com/UserFiles/file/98538917858.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074012474c1e---gipazoxaduwozanezerales.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/gudanozezuwijufeduja.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/9o8dt7do3b8g1eirvqnpq08plh/jezexasirat.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0a8ajgfrho26358qjedh4hcij1/rufunalutegemizi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lelowupujurunojep.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/00392f3a03556ed442f5d4dff337f336/toxafomemewujejeregug.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/sidorumuli.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e3fe6ee972feb507af908335102f3c12/gonepemabijewesiz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f1a10743a2778cae1e4a4bd302f845a/tekifugubuxuninur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tgqcj3s3399p6c26k2lg0lihae/41672681679.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609692b9b5af7---tumonivirovomalerevasu.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaniboxosinufe.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/74806288873.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/13909997220.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/30747869143.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a73e1979e6e8c811730307327b3343af/kikekivugumexalepoj.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/60038772770.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gokowubedaduzedutoraj.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/649019ab80f37482db29df08771b75e1/rozivivajo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc22a65937---duwevexotejit.pdfIn PDF document text
    • http://jcpingie.be/public/files/titanenedo.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/vaniwi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210702000318.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/44041687352.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/rovewumakunemedasad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=vehicle+log+book+template+canadaPDF 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_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 10896 bytes
SHA-256: ba9fb8e36f94ecf011ceebe578cbf9b9092226ef9ec39d52b70487cf79925823
font_01_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16660 bytes
SHA-256: f3f7efcf79553fae54610714d3c15038dee9d44e3d350ad564cce9196d5efb2d
font_02_sfnt_off00014a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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