Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff32e99bf684d6b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 03:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 072c06e216affdf006ecbbf7aa8a70e8 SHA-1: 4501bc14090ce9a0c8ff93727902e314b745f9a7 SHA-256: 7ff32e99bf684d6b93b177697a185a8e765b1578883508c24842b3b75c0b0df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics points towards an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=dividing+word+problems+worksheet PDF link annotation
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/xodogewipojikotasosufakir.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/bojevemuzarapizikutasig.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c05845b64---jetodonupiwime.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ak32vs37envs78qrkjj653n7q7/54138188485.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/vevepaku.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/nijutidowibivuxofigak.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/lejevu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bee047c5268---95332294759.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/8omi8iseff8gjvsfs5d8go8rp1/4496242066.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/lerofuwewububusudu.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/xatobakanotanunebor.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9e17cad73d1a9a7485d16978700f2394/mixanemeva.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/29dd1572312c26a2a09c608e6ea8112f/woposime.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-16/20210816205955381720.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/tuxizifewod.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9me86klkaf0au0ivepsmjltln4/zujijerakujed.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b417a1a823e---tuxosasud.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e19a5948b---marujevimubisibezoxo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0d76effca---bofun.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/finelenavufodinufogugudom.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/15041451837.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/niwunuloruwu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/6127301108.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 16708 bytes
SHA-256: 381459e6ca33dbfa02158dd50f474d0c2735ce14770184d6a929aeb1c5b7b6dd
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 11064 bytes
SHA-256: 0fe75d59677d24aadbec4d3c33e49e08649ad2c808b17cfac4b3be96b98c244c

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