Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e1a341acb10b18…

MALICIOUS

PDF

100.1 KB Created: 2021-10-08 20:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1ac61acf05aaece6f81f968a0e33e9a SHA-1: 4b67a433a9e529e44d2f7a176989f325afe27555 SHA-256: c4e1a341acb10b18455f95d320db51a160f955cae6a0bd3ae3048e6304d2d9eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware delivery attempt. The document contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615185d813cf6---sifodaki.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05fb77e23---53931093244.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/nogageteza.pdfIn PDF document text
    • http://pronobile.de/catalog/file/12619808898.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/87863711384.pdfIn PDF document text
    • https://alariel.be/userfiles/file/lamiwoluxoperuborukop.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/19417158677.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f0da225736b7f67b09ebf3d66eefac09/7444588880.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/xopisujudasenivab.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/jebizikegitumixafowejaru.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/76256472764.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161602fa6d8fbc---mixipizini.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16158b42b301d2---32516212866.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/luvanubatezowixed.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614985049ff01---mirifenexagi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614c69ed6023f---35950688163.pdfIn PDF document text
    • https://hse.tw/upload/file/badudele.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/binarifovumimipaxudomana.pdfIn PDF document text
    • https://kawanmto.info/contents/files/99625489841.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/66136113001.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/vupiva.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/kojufikigiwenumazoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=history+of+central+banking+pdfPDF link annotation
    • 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_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 11132 bytes
SHA-256: ae13f39aec3ea435b84c2ecb3b857a4dfe6041fcb5b0477dc48b599676b9b6bf
font_02_sfnt_off000153c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C2 20880 bytes
SHA-256: 383f663b4191f71328b49e86c74bdb1ed75e5357f183292d95ea71939e609f65

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