Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43892fc82534b10…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21d8e5f2c387737c3be420526f904b54 SHA-1: e0a2a2e469d6d53ac8a355e7635fd45515299436 SHA-256: b43892fc82534b108057eb4c38af87cfb055e8cb4692fe8f3f029319be46b7ba
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 heuristics reveal that the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. This pattern suggests an attempt to distribute malware or conduct phishing by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde615c7c0d---laronufidasasajuzakenata.pdf In PDF document text
    • http://strahyi.ru/images/file/zuxiwepojujadifoleziga.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/20671878138.pdfIn PDF document text
    • https://palet-school.com/files/files/26164240883.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/18562182536.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/70514808897.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/tuzediwej.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091348bc7f15---xunosemed.pdfIn PDF document text
    • https://cityface.cz/res/file/91726349350.pdfIn PDF document text
    • https://penzion-palice.cz/content/13564383246.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/23324963012.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/pemapolo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fcadbf731---92081123974.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/motuweforikezusuxarubuju.pdfIn PDF document text
    • http://4rrecycle.com/files/file/51107153214.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f230e152137---84641420801.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/xatuxavumunatope.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/torotibiwo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b165ed9165a---24844688432.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/vofekewalipiwan.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021617121106527.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/67738972400.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/femaxilikituvixafuz.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/wufegugejibatudaz.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/bolazuroxutazovezodolazav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=oxidation+state+of+oxygen+in+k2o2PDF 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_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 19812 bytes
SHA-256: 4aac5416e561fc0f9a43c4128d140a37b41d68d17c1373dc57e489104980f5cd
font_01_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 10836 bytes
SHA-256: 07adc946798f288cd7c43f6d68f38455ad62837e75c196f5956f72399f2bedba

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