Malicious PDF — malware analysis report

Static analysis result for SHA-256 608107761da519b4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 16:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81b5e0729ff7fb3f32d1594d12985286 SHA-1: 8f6ca62c900e4f9228e208537ae3a9190edd3390 SHA-256: 608107761da519b49971ea613be5efbc8c8ad43a722c235de0f5aeb2bb3c1d80
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to lure victims into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8017ddf3---68372990447.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/351d66f864e9203d54f37fa49b8245ba/sototulekugekapij.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2802e6dce26bc1dbae0571e390eb44f8/4706451176.pdfIn PDF document text
    • https://tigapilar.com/upload/files/88342105282.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160772186d4ad2---beziwovawinivavakekuzegu.pdfIn PDF document text
    • https://samowar.ch/upload/file/21706879339.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1d65ff7129eecfb39a39e3791fc0cf77/97737830618.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160706b37eb8d7---69155648148.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1e6cab1e7---80922986027.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/40798542953.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe09020f519---64512317298.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610ce5cf449a2---sewatosebesoseledese.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pezuj.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a0e1529ae23657dca3909bc0b3b1f593/xasisudadidetosarirasi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4a2d4f56238ae45c6c0a563f53b3716e/43983817461.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/95829561465.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wufofoxogimokutome.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d9c2f3df---kurizakejoxidixugubepela.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/49610809054.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/64965115750.pdfIn PDF document text
    • http://youil.org/userData/board/file/35866238125.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/dewugewumazake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lifespan+development+6th+edition+pdf+freePDF 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16872 bytes
SHA-256: cb98c1ca3dd5c06ecfe81e2aba384aef98de5f5467202d39c15f82488cbbbce2
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10952 bytes
SHA-256: d9811d9a65d7316427edb42bb367d1cd8657b2046a3d54113eb6b86a4c92eb77
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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