Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2c98df5e4f4f04…

MALICIOUS

PDF

85.9 KB Created: 2021-06-11 02:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 873e8f947f7b414a84d487bb420a6fb8 SHA-1: f05a4d4d2d3caa35583dc2c9870a5b9d01476dc0 SHA-256: 1a2c98df5e4f4f04cf560625e97d1979972732fd598fedb1c7e5a7ddfd9a30fe
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. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://inwebjor.ru/uplcv?utm_term=original+sensitivity+pubg+mobile
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/a6ejcj3fps20nqrapmsp21045k/rizenisimulurilibapi.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3bbc980c2e2fd1b034a74c3ff1e81ed9/12118112081.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/14793799313.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b67faccab---91508505817.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607968953819c---toxijovo.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7f784e264c9a2fe5c61d28e92544e3e1/94119957496.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4sk5qovfmeu5ak52pdbopq2hq3/jafotogaxotata.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd5aedf94---19916436153.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2d7e41d330042bf8fce41b3561cfb6d6/sexijane.pdf
    • https://vannordenvastgoed.nl/userfiles/file/11714198283.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba0d43d35---kigabir.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865c4ae3e42---tabusibomivubowulenapu.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c611aea0---5999694686.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d23b3ae3e861ea2894b9cccc8e50218f/62293963004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee13.bin
ad40f8f128e85b9d78d04ba6493d692b33db21b6101cd7be12772565df99416e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5348 bytes
font_01_sfnt_off0001002c.bin
4ea243098bb95a20fb4cec46dfdf08d1ef5df5edda821c8edc20f56a68544374
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 10784 bytes
font_02_sfnt_off00012510.bin
e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443
pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16168 bytes
font_03_sfnt_off00013a15.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 4324 bytes