Malicious PDF — malware analysis report

Static analysis result for SHA-256 13732f0e9ffc20c9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 16:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b9aa541c5860bfe529aae17eca19a612 SHA-1: da0c977dda8a4ecdc77c5657dfcad43c5ef3b89d SHA-256: 13732f0e9ffc20c9e1ededac3aea56d319ff692a589a82289f0d61db326a6437
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ba59345569c1d6c3a6e48e9ec58f20bf/48804918227.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c621b158036---mamim.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/vaworutefozej.pdfIn PDF document text
    • https://menu2uplus.com/images/file/60326157052.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/wezikanurij.pdfIn PDF document text
    • https://aspirans.com/files/file/9382716307.pdfIn PDF document text
    • https://reniuved.it/file/98405709595.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062820450380554.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wofevak.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44059c85ca---bavuruzolufumowenukerufid.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b8ae382a6f8a2e19e7b3a212a31cc946/rusopijuwelotigigo.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/misiwogofug.pdfIn PDF document text
    • https://fallsplat.se/file/99551835917.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2a307431a812d88528818d30e55ccebb/90033517354.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e70562bd---wozazupazoduxo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076072843624---jidukejiv.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16092f24a15066---36481392413.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f5f6f8accbe51cd6c7fe59e3e05078b7/sigajamarufefo.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/93973091171.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/fd58441f79d8b09d73b60a8f1353da68/47811842400.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/dbccff0bc4773479cda2fb731cc421ac/bobapexadonetajozu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210529_050246.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/vowogu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/kojemigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=breaking+up+over+textPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 1704 bytes
SHA-256: b000ba784e06dfed05e5036781705fc03053f75fb86b6431fcd8f8bc5d31227b
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 10628 bytes
SHA-256: 6be356014c343e9d610ebccdf280d4cfe0ecdebdbe921aa7a483c848d54e805b
font_03_sfnt_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 17160 bytes
SHA-256: fe2356f2808064fa705f0ab494b130c7f30ce44b814c1c691c09188038247e0e

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