Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba930ed3e830f5ba…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 09:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d90834225ddf15568c0adc14960c676 SHA-1: 87dc5d654b2b05ebb6894acf474d6c7c821ac0eb SHA-256: ba930ed3e830f5ba5b4238ce716d267dc5572cedd354c39cc75b700fcc06b6a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chanakyaaerospacedefence.com/userfiles/file/72577250662.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e8001a6b---51806568006.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nmji5ssviu62q7t9p3cmb2k19p/wapiwena.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdfIn PDF document text
    • http://webursitet.org/Files/file/63594184380.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5412d5e4fac38e8ce00670bebf0baa65/noxiwaloxepenabare.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210714/file/1626242783.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6b9c59344ae748a8ee8033f158f99fe5/zitidujojebuxasitixeg.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac51408a7---zixiwofizumivogekal.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b498d6753---masowekusodoj.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/solimizav.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v2t4ulk88eqsffr53civeegeb1/fizunododimobi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jabasurod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b6824ab9---zuvalugifezafamowazeruzi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8c8ebc57529d98248ecb380ca06d5d4/miwimijoladivunuxazi.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/67747712677.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d606928bb5---nivezajevewafurotonipoxix.pdfIn PDF document text
    • https://shunnasato.com/88128655375.pdfIn PDF document text
    • https://onecre.com/images/content/files/bovir.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0e99ef27---30820442169.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdc39482c---73384132410.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202175123350.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ferapeburijon.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/mibizugipinov.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/biejelmcpgu6ak7ela4v1u47ab/zilumisifelekolofafewezes.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a6c23c678b0e97f8efc6e9b8839ad43a/japodowagesekokizezodoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=guitar+turnarounds+pdfPDF 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_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 10452 bytes
SHA-256: 7777706fbf90b86e7f84c27e3d57e202a6f988bc9611bb6f0631b96b03930a7d
font_01_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 18344 bytes
SHA-256: 932afaaf14c2fa097fca2f240f1238b83cc393aab06da094dcfa41dd5d70c26c
font_02_sfnt_off00013fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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