Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66c3920221aa865…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 09:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec141bb12e0e085660e7ae4a9f6354f8 SHA-1: 4505c00c3b1865e61070f4b60fb6ae4ce2283406 SHA-256: d66c3920221aa865213f968fc5ea25e40cbfffb98bf32e076cbae7fd219cdff5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ketchas.ru/uplcv?utm_term=the+body+occupants
    • http://antoniolescio.net/userfiles/files/7014940162.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072da9c81dd9---wipagabofaxukoriwode.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160acf148c2a7b---94079419383.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c85a41e48---riwapuramodaworigegokamaz.pdf
    • https://casabresciani.it/uploads/file/xokomikopuxejubexa.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/99b201cf090b9943e1dac2148a53eea2/91161619652.pdf
    • http://maduraigarlandshop.com/userfiles/file/86213899216.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/k5umdvbmvjjcr9t1douhnoffi3/feraladi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c621bc3f98679b0361670ad18a11021c/70286794854.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nshpfsqhv88iom3lspgn4745c1/92786020129.pdf
    • http://bellina.pl/userfiles/file/xanigufopo.pdf
    • http://thedewakohchang.com/image/upload/File/2434667406.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b2bf4b92b6f879641016f51e414ec006/55768788453.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca61e9976c---53427167642.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc319fb5970---96567254490.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/025e722f4577fc3c8cb6677a34a48405/96073511871.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vdjg98jqf1758i1m5i964qrt01/29867295002.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb42e3651---fugaso.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c7897e1a---65511665022.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f093ee9ffa---roratipo.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a30b8fc1d03f4dd77059084c4f70eea/momofilane.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f507a56782d7c3ba82ef2fe12dbd0634/linolemajulepoposuti.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31eb07775---25633415414.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/555cda9ed0e71dc1759e156afe884e12/woxubokikewoxil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0a.bin
6402d0677c98e35a158aa60fdf38f275735e832eeb28736d84e177fe7bb6198b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10692 bytes
font_01_sfnt_off0001145a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 16792 bytes
font_02_sfnt_off00012c6c.bin
3cfae1bfe28b496f81b25e468c230da780c7671d9839337f1b6f3703b40f328b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 18232 bytes