Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e81248d79d0bdd…

MALICIOUS

PDF

84.3 KB Created: 2021-07-23 09:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7e74180dc03a57895937e1c2ae13fbf SHA-1: 274a16f79c611ebdc171eb19aad3405d69f81729 SHA-256: 03e81248d79d0bdd233c6f0d042ca97619609e0330797299371e8dacf425553b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/38812c9d4ed87899b07fe611727c6184/28958725616.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/19up5ruie9aleh5chro9cfjhd9/38584271563.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/96315969891.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/8742f8a27f4ceca2e9ff5ddab029fdfb/winekefijobor.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/23378542511.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a04141db934---soduremofipik.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/27385260991.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/luzurifemozanase.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/40626438894.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd33a1309f---58179678485.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee03c6c0d7e---78285446591.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/zeteruzijaju.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/30381561840.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573f1537f4---xigusufakodenugina.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rke3pf1kmgnoj6o0gdvto8bust/xajiribexegafevoda.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/92112582902.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d669e48f5---74081979406.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/dirafowazapovuwarev.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/30565590455.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mexuvamiso.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/5d26489779d30719082104170941feca/6483777546.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/17571906206.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/16836907661.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d1d9979fea6500ba602ffe84a379e545/68496808961.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e2fb8aff7---webisasijofimevigitepimi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642f264aaf---78625218561.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f24a87b0f896461d75aaa8a4d7c294c/divunoxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=csir+net+old+question+paperPDF 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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 16900 bytes
SHA-256: 09fea46c0cc5c24b9c5f028262d4570d91f7038709c173e3f409d2c4690f9b08
font_01_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 10664 bytes
SHA-256: 4ad51947bad1d961eef18278183b2e9c31b95b010e287a89744e20218489cf0a
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1