Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ada776ae7f7f3bc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 13:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac5f496a4207c66fdfb15b11096ed92 SHA-1: 89a7fd95376ac63826762ed01a32c7339f6ea8e6 SHA-256: 7ada776ae7f7f3bc96da5d193cda615a76728c1a7cdf6d8cf938843c57ba1cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://e-room.co/userfiles/file/12786589619.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613656090c52a---65008956529.pdf
    • http://mosme.org/uploadfile/files/31910449564.pdf
    • http://abwlargo.com/uploads/files/72752048277.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/93509601123.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/zatasosuxapu.pdf
    • http://denkobarbell.com/_upload/files/tolifimu.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a7473df49f5f5ceb58fe4985bbdabc3f/39999664273.pdf
    • http://sdes.in/uploads/gozowonono.pdf
    • https://smartcrm.cloud/upload/files/xanozakibajad.pdf
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/mosipizofatunotito.pdf
    • http://www.dean-cpa.com/files/adminpic/file/dufuboretoxafelenisuv.pdf
    • http://vidol.nl/userfiles/file/68926406235.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/68099644780.pdf
    • https://tuinvandecruys.be/file/10519448492.pdf
    • https://dansobentre.net/uploads/file/xisotokuseresekagisoko.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/3869204740.pdf
    • http://artpolinakuzina.ru/pict/file/pojakuguvu.pdf
    • http://umbabox.com/userfiles/file/ginoromokuwakelaronegad.pdf
    • http://aptekadc.pl/userfiles/userfile/2175134549.pdf
    • http://goksirlambinowice.pl/img/upload/files/43289554139.pdf
    • http://bagliodeimille.it/userfiles/files/38631415524.pdf
    • http://tbeaindia.com/userfiles/file/60126779096.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a47844cafedfb54d08e6c86cb1ac319b/6229115763.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/751e476b6bfd35ded2fdd937bbf65c94/75189133354.pdf
    • http://deforma.it/userfiles/files/zovidoxomologuvuvitejisus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=unturned+metal+wall+sign+id
    • 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_off0000d37a.bin
921fc0792f247e24b73ea6787f287e24680f90ef41293b17407fdf3966b394b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 18260 bytes
font_01_sfnt_off000102f9.bin
9dd30abcec70d913c68ce1d7130f7a30418947e74122f5d8d69884c06c3f88eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 10664 bytes
font_02_sfnt_off00011b36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes