Malicious PDF — malware analysis report

Static analysis result for SHA-256 41014306b4373a17…

MALICIOUS

PDF

150.8 KB Created: 2021-07-04 14:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cf3ee3dd388bcdc5eebb6c6e6aeb28d7 SHA-1: a64b458c50e6719f295f940c53ace1c85f53863f SHA-256: 41014306b4373a175cd6440c7fc558eddc7da52cb856f412320d93590bbe774f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is unreadable, but the presence of numerous external links, some on disposable hosting, suggests a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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://momsystem.ru/public/file/novogigapol.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b1200fcebeb3dbe70722ef39729671f7/zekesejafa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69b825c45---jodutenibipatibaze.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/j6lddlghkj9nq5sfv8bp04htj2/jubovame.pdfIn PDF document text
    • https://sealskinz.ru/files/file/ridegi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e98e35f8ba4023e612f1b173e6ed888a/24680498673.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5066a5d6fc1e0c7f54a2cce6499b798a/67462468690.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083215b22a09---91466548595.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7fab749d20a40d6e40271059b8d3a9f/42962008355.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4180572f8---tuxik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4f98ff81---vuwulan.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6b12bdc93fbe689d1fef04a6a1d37104/28694807314.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/womok.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vetirorobezedikosepa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ea46425f---81844481296.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/xesifubulufigafezozok.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pazuzumijizukefanukadevos.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622211737.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9672b6bd10---95699101728.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5fe992026---39261498092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=could+states+secede+from+the+unionPDF 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_off0001e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E90F 10872 bytes
SHA-256: 75f9106a9544da6d0cf45d8a5322b6a41a0562e3df54c7317571cff8fe211213
font_01_sfnt_off000201fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201FE 20104 bytes
SHA-256: a6b9fb8d834c5e962933e63636ec34245e82f184d729f638b14c440769cd067c
font_02_sfnt_off000235a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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