Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83dbb90607469b0…

MALICIOUS

PDF

80.8 KB Created: 2021-08-26 04:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fd29064dd385e511154162cde40435f SHA-1: 2b644f2d50239e30e5ec4455994fd317e017d8e7 SHA-256: d83dbb90607469b0b4fc174ce0b3d8e799a58c39fb825f7faf7f8ddfc5880c8a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://martabaktelor.com/contents//files/221427751.pdf In PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/21606827585.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107162106166553.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ouid1coaeet7bcji1gai9p3n16/marebipadunitevaxoro.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16090db0e84c6e---5822063182.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/df7ab69c06ff4308d57d79f026caa016/bubodinudixijedak.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/wenomejebuvikavufineman.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/63762678175.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6c5a7c34e2cbe4f62c6a937c5ba7450e/rizuwevajapemagaje.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/63275446946.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082c29479bc9---mijubitaza.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/sivefaxotagupip.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b4621489a---wimawitipepirosodaf.pdfIn PDF document text
    • http://airfa.it/userfiles/file/79816325087.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/qg6cvuo23p3arced2vitqo170c/59576826926.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ja3lsvh967mg9311nsc2g317n7/19183053135.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/81200336100.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/60926039499.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609033ffdca9b---20383683775.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160903ce4504c6---68289077489.pdfIn PDF document text
    • http://rafaelokazakov.com/file/wekurokuv.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/44917593691.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb12bb177---326080485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=1000+pennies+equals+how+many+dollarsPDF 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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 16148 bytes
SHA-256: 761eedd4726443b0610a1b84bfc33c2697337d333ce941ea4fc953966ad02cf4
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 11084 bytes
SHA-256: c7b89af07e6a2190930c1a3ef762236e1e4f800e4ca16ba8a6623384b9266253

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