Malicious PDF — malware analysis report

Static analysis result for SHA-256 156a10d2aeef181a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 22:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 65789aa4d7b81fe02106e5f5f1661903 SHA-1: bd82deab90794daebb901fc1bcac5b0f856a42f1 SHA-256: 156a10d2aeef181a8a8b6f1fd062768f394c84b3c70967f4c75986a24ae08c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=iphone+ringtone+download+for+android PDF link annotation
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xebozebalamigebu.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/pezinolimegoka.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/bazibirat.pdfIn PDF document text
    • http://topas.lt/userfiles/file/vikelus.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zogepopu.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/fetowa.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/51949915108.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/zufog.pdfIn PDF document text
    • http://dzbnf.com/upload/file///42646346858.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/vixamisolirex.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/jugekonuwofodezoruv.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/57707695420.pdfIn PDF document text
    • http://torgoborud.org/images/file/75964999377.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/509a64fe21b357cc1bb54ecfc1d8caaa/fidolorozejixupapobal.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/87373213497.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/dizanujawilovojububozu.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/23126085845.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/2838494936.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jiran.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b34c89f6abdfd7099275e4d601e55af9/wimozi.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///gupivovinotenisu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa71a83ed---77976186895.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210907_26A711FB80987A70.pdfIn PDF document text
    • https://12shio4.com/contents/files/80383190712.pdfIn PDF document text
    • 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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 10644 bytes
SHA-256: b6e5837e26b955d531ed7194baff3b56fbea21047250e892d22f2d0125b48ab9
font_02_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 16428 bytes
SHA-256: faa2443c0722a56cb6144d5eb9a6e17a62e931f66986e816a9d2e963e12312b1