Malicious PDF — malware analysis report

Static analysis result for SHA-256 d882dab0d9ab8edc…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 22:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afb7236cb4429ebfabb733e9a140ff1f SHA-1: 3258bc1a47099ef9e80f46b8eb606bead05f45b6 SHA-256: d882dab0d9ab8edc2cc69f3602f0bc8f95c487b5ca4c71f12e559c425eb73cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://abhinavabhishad.org/userfiles/file/36154791189.pdf In PDF document text
    • http://dgelc.com/userfiles/file/20210904231142.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/rowegimosekewob.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/lajubijusawini.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/87133893199.pdfIn PDF document text
    • http://umartravel.com/files/nojepixu.pdfIn PDF document text
    • http://ijfbn.com/editor_up/lalokirowuluburomefinop.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1fd08266---4511015459.pdfIn PDF document text
    • https://wrd13.com/force/file/44287730070.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cd5063cab1871f3dc960caf217b33be9/lufazolotoleladutuwop.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/29021366943.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/2683628263.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/joxonowixofer.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/19730999841.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/mukinotilubedewu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eced98a132---mabalofasupesaraweto.pdfIn PDF document text
    • http://vaynhe.com/upload/files/kowamug.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gedugenenorenafudidupome.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075596442---tuzowe.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/xisenanekuvarisuluja.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/kozuxamu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8330950a8165954858799eaab0690ec4/jibezamerusodosivalobavo.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/75003168366.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/30786240718.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/sebixonigip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sine+function+valuesPDF 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_off0000c4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 17196 bytes
SHA-256: ff7f9e897f7daea407211c44ddca05b791a8d2e534e66db2310a4531bae7dc84
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 10468 bytes
SHA-256: c8be779e97ed21eb60efbb26247ad6aa916620493efc2eb8940b4ba2da3d217d

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