Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f85d74ea7eb222…

MALICIOUS

PDF

89.1 KB Created: 2021-08-04 09:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eeeced65d81bc1cbe9beaae061b62321 SHA-1: 3d5c3f362d57cfd9e49764f5964bf24400a0ee9f SHA-256: c1f85d74ea7eb22281118209195983e9a41163edf5c4b21444db654e522150e3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised websites or disposable hosting, suggesting a malicious intent to redirect users to harmful content. The presence of a callback lure heuristic further supports a phishing or scamming operation. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://reicar.dk/userfiles/file/pulabuxaz.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3k2dsbeb4lbs9ps1qq10eq38t4/68600115727.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/gibuvubapakagowase.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/12627fca16b83c4db1c8f245ac5725a1/komoxekulobamupijipetat.pdfIn PDF document text
    • https://kristinanamaste.eu/files/gitifaxorovafasapo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/72381563580.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/81490971856.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d976c373352---dowiroxepet.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f48e64a1709---45831950679.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/7416354606.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93c9b3b42a2d75e61a0c05167a6406c5/6554434865.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1c0bf856b60cc47786d65f7d028323d9/94865364449.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nolakajawugide.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605105423.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/db95e109b60a738c3a6a2734520a91d5/tebivugezuribafe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/28cd193fb7036a2e64d3f1d0a0bee961/dudikidom.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/tison.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608453469e67f---gizilezapusemarulerogoz.pdfIn PDF document text
    • https://spacio.hk/attachment/file/xalofajibutela.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/76094758165.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/7809183109.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/zoluku.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/bazufijire.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210615215557_08vj4f.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e0f89597---ruvub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=deed+of+absolute+sale+lot+philippines+samplePDF 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_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 10904 bytes
SHA-256: 3a7522cebf0e24fb11583bf4d90f285f1dc8f331b49ebaa36848081979b2368f
font_02_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 17624 bytes
SHA-256: a280a91ae58764ceff4bc30e38c04e5c204f3bce8ddfa1d9c449a43e6bb7779d

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