Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b5aff3dff1b76e…

MALICIOUS

PDF

118.2 KB Created: 2021-07-14 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83d820e3f8641b596511853538590862 SHA-1: 9e0e8039954d762f9ed8e701db26b56bc180635c SHA-256: b2b5aff3dff1b76e24b0367d9b7bebe740a68f0520e438c93701ef499dce69ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b5173ef0f628793fd07b59e7d8e27e9/55579748400.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/61316825597.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/acl94uj75qo5vik2g7oubpq662/21520929016.pdf
    • http://laros.cz/UserFiles/file/xigul.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/56114435600.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aa4498361---18252986679.pdf
    • http://aldo-ins.com/userfiles/file/82190590320.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/emd8584jjplb14clack499qeq3/50026991083.pdf
    • https://sanipacific.com/attachment/file/juzusolozuponagamosixet.pdf
    • https://larustt.com/upload/ckfinder/files/midabezopuvon.pdf
    • https://responsible-tourism-alliance.com/content_file/files/66564659566.pdf
    • http://onnetsolution.in/userfiles/file/lesixuruvo.pdf
    • http://maszyny.pl/userfiles/file/vojur.pdf
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/64190490503.pdf
    • https://ascinfratech.com/clientprojects/trading/file/41266850727.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/70b9881i4ci7adh0airfs7fkj7/denosojijaxibopupip.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086398eea9b5---kijupimemovesa.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/varezada.pdf
    • https://hotelmitrutarija.com/uploaded/files/31214946258.pdf
    • http://www.dean-cpa.com/files/adminpic/file/lesexuzap.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1319764b58cfc4d9baf2a70f62771159/98768385072.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/18qncrpcr62eq1ru8o3udt08ip/kemozesotesapide.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+many+biological+brothers+did+jesus+have
    • 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_off00015da7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA7 16792 bytes
font_01_sfnt_off000175b9.bin
df06c98166bf96858141f5c2911dd284a76fa9df76cefe5741c1a1dd1bcf46b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x175B9 24140 bytes
font_02_sfnt_off0001b102.bin
835acd36d1a39a6daa495635f9c0c4697ca04470e7d0c87b6618818296f0d1db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B102 11444 bytes