Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a824d33f91ef2a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 04:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 030e67cfd79cb4e417569204c8571ab2 SHA-1: fcaa2e9f8b75dddf41d3854913c41344ad7e862d SHA-256: a5a824d33f91ef2a9ea5ec0d67e7cd84caee6326d993c302d9f47e74a6ddec4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ClamAV detection and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various external sites. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm characteristics strongly supports a malicious intent.

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://mimpishio.com/contents/files/94642710539.pdf In PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/72903995944.pdfIn PDF document text
    • https://beaszemin.com/files/xotojulololasulifuw.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/fopepavamebitama.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/nejusezabozigowe.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/44590290250.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/11607967238.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838180143e---fulodopidukodidufuma.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/62618472132.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/savivotaponisogek.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/52315980134.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/50943829766.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/riduz.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8d9d7272---xuvazovomitolewuselidemoj.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109012026342280.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/js71kso5kgp7ccac1sb4vl2etd/nagamarumaj.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/85492199686.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/11004119204.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/86734074143.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/wosatafakesosemexosumi.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/jazawaduxirifi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4740cb4c6---kuduziveroxejope.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j304buhthkfpvmcnavmpb0jeo6/60393861550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ssadm+methodology+pdfPDF 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_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 17612 bytes
SHA-256: 32cbd3f575eadeefa30517110fe6d42b46ac2a9d30c0d9b28a1de2c078519142
font_01_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 10840 bytes
SHA-256: 9a4082db3953b6c92dcf155bcdc6a278e2bbbe533548633b0d65662a918a2472

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