Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a84df5534a31c5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 10:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f4366ddf18816af4bbe63e7814f0fe8 SHA-1: 2f73b07bfe49b7cdd025cbe0861776f827fc07ac SHA-256: d6a84df5534a31c59bb6b3f68ae832f0ad7fbd70cac5ff95510d4b65556ed645
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hhoasis.org/app/webroot/img/fck/file/fipipoxobamubupik.pdf In PDF document text
    • http://inwama4.vn/webroot/img/files/ziwogemuxazezoxonufig.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/90117053902.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5f6b30f9---bovidapewuxudit.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/mubepirapuwuve.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kutasesifopusejubij.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/teviribobutup.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072415094773499.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805c1ae17f8---28386367701.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/1561340548.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/60463404617.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f78c45ed477a2dccd0f950277a4e9ebc/vajavuzutadupodeneji.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/berodot.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/15889396810.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/bebapevuduxasijoguxet.pdfIn PDF document text
    • https://keongracun.org/contents//files/gifaxonigesilel.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/80703160678.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210814_CCBF424D7FBFB654.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccab97071c---46587992147.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/senakijir.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f3d607b3d---14314766543.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798988a6929---74808189059.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab2b5fe0a---kofuzowefafot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=whirlpool+3lwed4705fw+manualPDF 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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 11232 bytes
SHA-256: 93dd99565292f690964ffaed66135523de1daf4523dec0035e8e4cf80c5f6be0
font_01_sfnt_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 17484 bytes
SHA-256: a4d63692d814b16ea18c4d264279cbc782e05f1b2131e0e8ef6bbe9ca2f03862

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