Malicious PDF — malware analysis report

Static analysis result for SHA-256 37714e6c61a4829b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 00:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9740d6c8f15d111f492c58b913ce103 SHA-1: f03aa690f7941ee30f6ba2bb8af4de1653461ae5 SHA-256: 37714e6c61a4829bdd79c33c5dcaf065190579cff21df25505d6bd6e19a26766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://inwebjor.ru/uplcv?utm_term=entry+level+physician+assistant+resume PDF link annotation
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/45640706333.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pifegimonufedokilowumegif.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/42076913684.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9kodmeltsab37j9p4kvktc9drg/fadekixarezowezefe.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/zomigopiwuwexopuzi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608924866ce98---fifowevididegudav.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/lasapiboverefumumas.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210602_E2EC65F47FA3F84D.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a169356d---89737663567.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a714f6ba0f---39552997968.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/48946654506.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfde316665d---mapupoj.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/15952835992.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0bd1a725---52173709399.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/24442624481.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072f933ac0d1---56281173142.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9f396718---pifufomomepiwad.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/xuwax.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/10621494123.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/34403471269.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0u6ucbi0jtthi5pts9e4poqu54/58549247952.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/h0b40p4a6jsa13l1rb4j36ubmf/11543435422.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e515acda---wojuduwoz.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/lemepenexudorid.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81549444727.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc479d9d89---zimafutosirebonew.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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 17064 bytes
SHA-256: db7d6e5f68340d5971126cf106064ca79c95ea17145bda832079e4a52bbf2b94
font_02_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 10784 bytes
SHA-256: 9643a9de578a3674b5a7d6d12943f96e356091e8b0decac54b334b61b5dcd3d4