Malicious PDF — malware analysis report

Static analysis result for SHA-256 709b3a629b4d14b0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 10:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01c08d6f676a2672d72511824643f03a SHA-1: d971df8ac2e3b65a38e3f14529d051c2ae19172d SHA-256: 709b3a629b4d14b013d96cb42d478fa770a3f56d47d74983728234f3433a68be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URIs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple suspicious URLs points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=kyoto+tour+map+pdf PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3jfun0820n74lonprhuan3ep73/35500670822.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/41204313578.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6cccf6ea---xudebixololusokazaxodaj.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/munasusewixeniveluzuresi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/53463184798.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608980ab99a77---6974959929.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/afe66446ec576725719f3e92dfdf16c1/tusisuxadogozepapuj.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210624091524.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/81638310077.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wofubowofosimavotoxuxo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/sl63dqnj38gmk4d709v9t4k2b3/78977861616.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/3317189325.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910e8268956---3443530581.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kajifosojopuwigalinala.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/263b9b883e579bb883eaae0966b9bdf2/lolumexuxexiz.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7ce32a25d781e76bb9cbebdf2273c367/filiwavulivijujave.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/38850408245.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sqffpkvpbvvtevkq8k4l2gsq4i/29861761713.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0be177c6---48964391558.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/satagegaper.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/rofepur.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///nerekusa.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r21id48q6p1ir9h731ghehomjq/lefoluwawoluwixixibep.pdfIn PDF document text
    • 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_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 17352 bytes
SHA-256: 1217f635841181816ed8ee581ea263b93d53857962f0d7eacfb683441b97ce6b
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10320 bytes
SHA-256: 16bc7f10295d275c0dc16c2992c9000eb9d2629f8f64822ccba3a77c337a8597