Malicious PDF — malware analysis report

Static analysis result for SHA-256 158efdc4598665a0…

MALICIOUS

PDF

73.9 KB Created: 2021-07-02 18:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a070267836133616182f007a11d8159b SHA-1: c372bc113fa3f3d84520f5bbd2c4de7df421dabf SHA-256: 158efdc4598665a05b0c1f8ca50dbf630e451afba368fabc5aed0713a58983e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://babamoleskine.com/files/file/93729628497.pdf
    • http://oreade-breche.fr/userfiles/file/66749290319.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf0dae559---dagapuzisavumebogofaf.pdf
    • http://bielwod.com/userfiles/file/dupipusoxowutokajis.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc613e9adc1---22322798151.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9985dd26e7---3990302344.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda84a99d85---zunesopuk.pdf
    • https://vestol.bg/files/file/jiveguxamebebipobibekuzav.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e851a604c38566b2b018ef85b6b63934/mumuwonividoxanozage.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9b86bc74---xinazijovugokanekiga.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7c628e8509650df41ed9b78d503c9e5a/64165481353.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/36b6b69286e15a3aa0bb8be9dbaaafde/junuzoruwajobonugapubim.pdf
    • http://wonsakai.com/uploads/files/vosevizazepolojivoxotup.pdf
    • https://stratasphere.online/userfiles/file/saxosizufa.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a3705862030a033d819d0ecf223f7000/76590124904.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f3eb0809---kibemid.pdf
    • https://texigo.tw/upfile/files/2021/06/29/netipubokigoxekamekog.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00be733c89---sugexadufinejit.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0f97e3ef---ramonufagokazox.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d21a92fb9---11328849041.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dfe2e58871a62447e34231b11c08f957/mojumogunaralubutona.pdf
    • https://pima-alarms.rs/slicice/file/fupatuz.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/viknm1i9k2iltbuar47f2mdl90/motebakozonukizewu.pdf
    • http://originalcheck.it/public/img_admin/file///3971516133.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/fetatovife.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=prentice+hall+realidades+3+textbook+answers
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf57.bin
57e120032efbea3d342ac4c8aa0535dc64aade0f4c18d98cc45d961d24a09fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 11060 bytes
font_01_sfnt_off0000d922.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 16792 bytes
font_02_sfnt_off0000f134.bin
97a636e2b2a09f542f96a3c87997a2213a638bef5ac40f54323e816e431821d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 15952 bytes