Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdadcad991115083…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb3314eb1fe825c6ccf648ed80c56288 SHA-1: 83e6ff0c58888c0a3d166b3f2b370b3e793e6c72 SHA-256: fdadcad99111508320785688da0ba4f8b69ca3cc6ea0f87f4b0b7b5946bdea11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of urgency language further supports a phishing or social engineering pretext. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=structural+geology+robert+j+twiss+pdf PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c57a20b0a6---73929052630.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29363608b9---80067684127.pdfIn PDF document text
    • http://olympusflights.com/files/files/64272181189.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/33029513358.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zuvirigudogipup.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/pupazabezatemefoxupupe.pdfIn PDF document text
    • https://binhvi.com/upload/files/53397714810.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3994a57aeb0f78e5983d49724c375410/bizunevudubabagivosorebus.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e77c5fdfa---86320226600.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108220555513084.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf931d18370---80275631757.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/tujogeguvokowazikol.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/48021605106.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/tikekekav.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/kujepukem.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ea5bcb4b6ad731ec32bbf8f85ffeceec/xaperek.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7b78487d2.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098af376c592---72239506071.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///51870766871.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a7b5843b9507e6536f26dda806aec3c1/gatawepatugenureboj.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/emgkirqedrl9p9pbon4thvobt0/sudakobinasilibaratitosup.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/vodapalexelukanabemixodik.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_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 17644 bytes
SHA-256: 5d5534d7d765dd93a16ceee78fd142448e45f38fdb7fbf3236e5b9d923eaa669
font_02_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 11336 bytes
SHA-256: 4e6c57098e342f07f28e84bb5a64821d704fbc051de938cb8c517f37ce489f5b

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