Malicious PDF — malware analysis report

Static analysis result for SHA-256 d257ada683c83b38…

MALICIOUS

PDF

74.6 KB Created: 2021-06-26 10:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 277ffe65c292991b334824deade6d836 SHA-1: 35f88f9486bcaff0cb4f739c5cab563ec05de7e1 SHA-256: d257ada683c83b38f7e2b5ce8853baa31e15ac5b9640767653f0031c8fc9c4f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=mastering+the+boards+step+2+pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/42gna50piual26v48gm18jttcb/kitoliradikenuvaxovawiges.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/98317ebaf73a559ce157cda502d86d45/60118115506.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/bd9cccc88ad890f29f9e14283d9f50c9/40345397991.pdf
    • http://rustproofingottawa.com/userfiles/file/37801789164.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad39b87574---63616727903.pdf
    • https://mumegram.com/userfiles/file/71990413334.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/omksvuepct2eftj1ii69kmorhi/monerukorulebamo.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c74468ab0071d0663ff0eac11214b722/bozimegewaxukijap.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d5e6qa3uuasefs9rcvbqjbhui/xotamoborezu.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ea9odp6f382j9fnj2ef6g2ang7/51500900716.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160859984badf5---lijitag.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/valetonabumalaber.pdf
    • https://armagedonspedycja.pl/files/file/18961691406.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//rafumunuderezorolaxus.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2a36db43758d405e9f0d040b3552aae6/70570714785.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fa9839ab889a8277fa67af06663af958/76480324519.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7a0be0b3---34551290160.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d5f7c84ba4e75877ed1dadd66785e6c2/sogubizu.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8mfg7jiuci68dkj7enleou8ug5/2012910414.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rjc2obaeo5q9e3bmmjsb4qgi73/56959966268.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cc5a77e316fa0c019af758efb2729813/93103430568.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/108ggtm6ltset9o2m253go1ta7/jabebodi.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_off0000bc9f.bin
adcf1635b3bcfcc54496743798dd67d400f47f5dd066782a9648af540573188e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9F 18132 bytes
font_01_sfnt_off0000eaa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16792 bytes
font_02_sfnt_off000102b7.bin
28598ea9a82d17a27e61bcc5754d81cdca8de3bd987b73727a661420239e87f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 10984 bytes