Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdcaa8d00d96d96…

MALICIOUS

PDF

94.9 KB Created: 2021-07-31 01:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d86c6140fc0aeadfe8f882459c2c3582 SHA-1: cdbf9532a07cf4d57179bbc68ca0083dd45daa53 SHA-256: 1bdcaa8d00d96d9655dbce764f975ec982acc91e2e31b659a9cb2c18b771f5f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7c554d0f---nowevixolaxoxa.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf0299227---renopew.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/jakulopediwekogivite.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/65167788490.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/60b6a9b507e2fc16ccf6e51eb0226f4a/75610435066.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/79832954114.pdfIn PDF document text
    • http://asfalon.com/__files/file/30835252164.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/rikivuzigip.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7c4f885b32a62c9ead61744c53c9b513/wakike.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee0b2e4eb---17534730577.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/50361318364.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97ee08771---3711880836.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/wijijuwatotuzilogesuwafaj.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876dcd35b7f---84434214138.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff3042ea1---tevinusumo.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/6715314794.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160852382c4272---mikotapatobozuserirafefa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a2c8af09---96408807195.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d9fc096b5b073fc027c431387d601bfe/telukoboduzopupifijemose.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e0nl68jofvr670clkobmdfl5oa/lukosudofapomomojuz.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/nisodaxokubofitovufa.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ddf668e03a7ab67ca58dc40a91b6d0b1/32414149414.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11262343597.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5d39759ad7469311dbad2db7ec1c5f9a/balanetoxemobewuv.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa629ca71d---86942091340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sig+sauer+p229+legion+vs+elitePDF link annotation
    • 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_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 10956 bytes
SHA-256: d6d95a299d2485ffa3c9943e48d8f34bd3819a6fe438c79cdcaadb23e3a2ba3b
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 18156 bytes
SHA-256: ecb59846f65d133019f8994175830bd038c32932544f28f17e66fcc8ae579371
font_02_sfnt_off0001537d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1