Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1edcf68f8d6ef9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 06:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a594caabfa3b9a456ea2deeb6756792 SHA-1: ab01c15066a84d9b6c06c92381808e3d5ce2532a SHA-256: 3a1edcf68f8d6ef97b1d1940cf92d097320115cc83d1869516cc7f4a4904be26
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or tech-support scam pretext, likely aiming to trick users into visiting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://catamma.ru/uplcv?utm_term=hp+elitebook+840+g2+specs+pdf PDF link annotation
    • https://vishalahospitality.com/ckfinder/userfiles/files/55748735346.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/tupupozezovilijijunomol.pdfIn PDF document text
    • http://szwygs.com/upload/pejudelametiva.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610992508e424---65554250729.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4d1a556fbe1c5c3f45c543ba8a593cd4/pufasobumetogek.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/xutovemo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160926dda6e974---fowikujiw.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/88420477544.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b72b1c8d---pejidala.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/ditonolofifovaxixi.pdfIn PDF document text
    • http://18554080.com/userfiles/file/lidifevivivarufajovofeji.pdfIn PDF document text
    • http://askort.pl/Upload/file/vovasojogupan.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a22088055ecc51a3ff73a1639fbc06a8/vagad.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/lq2g6c2kr92toekl5pfbnrpt91/46095206293.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/bobazilogadar.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec52c429024---30294307776.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d669e48f5---74081979406.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/58836534544.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e17b0f182---gejuxar.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/52f89dd85bf72b9052acc957d9fdb4fa/87820687688.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/33436088820.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/bavafinapogenubu.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_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 18056 bytes
SHA-256: c2d4a058d2e10260951fb9c03f2ceed2b732880f817c98dec634979b8a06bf44
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 11180 bytes
SHA-256: a53823918cbf4ea5186e1a1aba3fefdf58ebf35f9e4aac1618a4429ee00ab369

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