Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad3cb70abdb67f3…

MALICIOUS

PDF

85.4 KB Created: 2021-07-28 10:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc887f7e467da417e07963bb5b61e48b SHA-1: 244d26a598dc9e07780b15eaeebc381838fc0289 SHA-256: 1ad3cb70abdb67f30b25fefbb49edaac61e023be26c513f19918b56cf053c8d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d9fca6a052b9c907964a11a2c5561d08/neguse.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1caef7e7---xuvule.pdf
    • http://07-3739589.com/CKEdit/upload/files/semoxegadi.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/17d72f850a34face685d4232d889ea29/61612246499.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/58387f8065495265ef0dd70324e8c0fa/sowafamevavi.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74519d973---gikapazanagugafo.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/vutubinidori.pdf
    • https://luyenthitoeic.info/userfiles/file/2238204759.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/408324fa8fcdb739fa176093b2073c96/60737205388.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2061f269c8fb1c313ff14c32ed8f51f3/48678233204.pdf
    • http://billsky.ee/files/file/13235558012.pdf
    • http://crmrealty360degree.in/userfiles/file/zipumijakumixeduzapadelil.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb1893e435---6936289922.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7b83fur1uagfle7tlmpl8m36s0/45665044844.pdf
    • https://advantagelic.com/singhania/downloads/file/nekuzatojejanarevumaxijo.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ouea1paclc7htomb14n3eja9i2/sudugekemek.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/c62467d0c0f975f7f1a19ae4f8eee289/nozoromulirebizosumuziz.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/10t9f57s0rqqpb4jt59of46nko/biwuvudujajiwovozo.pdf
    • http://campingwithconvenience.com/files/files/fokorojezolik.pdf
    • https://ebooksweb.net/files/file/49422639718.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5992c71ff19b070ddea800ffe0f11b21/gatawuzudamoraxewon.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/94989811562.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2a4ed4a11315466e0dc6849ec46f7d08/42381390006.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=data+analysis+using+excel+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_off0000eae9.bin
0cc5caeb1d5bdfcecbd7efa3ce2372f5163e6768462349c70116434e5e506eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 16936 bytes
font_01_sfnt_off000116f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 16792 bytes
font_02_sfnt_off00012f10.bin
5054b357ee57333c793e7e4d9ea9c539291e050907efca9a2a84eff2ff5b4c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 10892 bytes