Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f609b2e70b25ae…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6892d652b37fc9074bc9ee57703401e7 SHA-1: 7e39ffa9af71b252652c0db1e8ee044deb7a5cd6 SHA-256: f7f609b2e70b25ae0240c84419c544aadeeb84f9aeedea21ec69dc245d03e2f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://abyway.lv/images/ck_images/files/xiluz.pdf In PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/rivekipu.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/82510068481.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/86564646333.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/lesimile.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/49650913536.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907062040.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/tisimexoboxezepiririrupi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/3t29q1rsgb3cp0nt4es7p8kbq1/gevola.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/vaxunewavoruxunit.pdfIn PDF document text
    • http://panteres.com/files/files/pedofonodubabaki.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/kevibepupaniguxolagogexiw.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/73228823109.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/bebaribelugoxami.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/74655829709.pdfIn PDF document text
    • http://arablift.net/userfiles/file/gaxotatuvudezekumiralev.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/sodujulisazafigaw.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/44804268841.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/tixigesiripa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135ebd55c5eb---menexujenobu.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/87649154752.pdfIn PDF document text
    • https://12waktu.com/contents/files/sukenuxuledurux.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/desexawawafe.pdfIn PDF document text
    • http://underbutter.cz/download/foto/nasiwedox.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e0e5d8721484cb002f56ed9ec93d280/kejuxina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+dark+mode+themePDF 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_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10372 bytes
SHA-256: b207701b7bbd9b98ee862287d5d99f9209d50132290dfff01d4235403d8e6d4e
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 17452 bytes
SHA-256: a4a196f624ee7f1c770e2d13bd4ee48ffe062c42c15ef2d7870bd4eefb75b955
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1