Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f04541e25c2a1d6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 04:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ac4608a5f49d132f5de041c7b5e2028 SHA-1: 314633d255d45bef6e880009e8664d7b2fdd7948 SHA-256: 1f04541e25c2a1d63ed0b23a9abd22c1ec6e34d713f7f5144b4391051aeddd83
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://aspirans.com/files/file/21687408997.pdf In PDF document text
    • http://tataservice.it/userfiles/file/tokeneweguzizuxusuj.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/71962130757.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/norejag.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072271b07828---wugibuteladizorilose.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770eb12aa5c---kabuzoxazumub.pdfIn PDF document text
    • http://chikatere.com/Upload/files/91596779449.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/a65dktnsnqd4qkp50ulin5ojcv/16999977138.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/03dcd30a59cec63bf4e10e4aea55aa50/70425471153.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/kepawilufatimedexizeke.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/mitozonibawudanakazopapux.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d224ae3ccf---62835849142.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/gabizulusakabu.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/xuwaze.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xanulagatevuwisudoxe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac3c6a993---bewogetedamilodaf.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00a3038c32---26955527723.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/lewedewodizopabew.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/03960f2d76391f7ff38d9c1821eb4cd3/97317288050.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/12ca133cfffcb917a8fb22e1f8bace1a/nopirusujasokamuju.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cecca59a4a49f4e5adaa90a6aec3225c/66620794319.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/6984740220.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/957fda615e2bbc357d2031976f490acb/23270337106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=do+bumble+bees+pollinatePDF 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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10552 bytes
SHA-256: 7557b3c46a765604e88f3ad1c50c74ed6fd222a7d44f90275a3b75128073489f
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 17364 bytes
SHA-256: 6f32184d3eaf0db640f0f6e64546adae0ab2696841ea1c0d69eab5feb625a64f

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