Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39b1288ce3b028c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 09:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58823d63f743c21c37d9320d43528f69 SHA-1: 1de73d4b656913db06114a958619decf9430f487 SHA-256: b39b1288ce3b028c866886549fc4c03a51291773bff2314aa812d478ec0aefb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious files. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb29335db4---lomigexejexozaru.pdf In PDF document text
    • http://suranareecommand.net/UserFiles/File/5589990213.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8dbec108---gesesekibabirup.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/motiwekul.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135152c2b81a---57281890232.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/73714093850.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/timejavoke.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/jijobuz.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/23393328950.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/47091702432.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134025c8b04a---26331223082.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/82662882940.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/27365276520.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614170c9571e0---jedobebixewirebe.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/puwilexonowido.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/ruzekowa.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/84683056046.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/labigotenotokoga.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed0f96cf3b---66258087495.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/75783052466.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/pewukemiwexezaxunuwezez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+emu+for+linuxPDF 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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 19236 bytes
SHA-256: 0f9911c9fb0dc15a956e80da8de69e694f042b4799d7bd1abaf92ebe96ef3f3b
font_01_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 10272 bytes
SHA-256: 728addb3e33ff191d54c4ed722f5492fbc333b2a953341ac0eb2ea3e9c3aec46
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1