Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba1b193b29e1eba…

MALICIOUS

PDF

88.4 KB Created: 2021-10-06 11:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e64dc854a068aaf705921cde54219b9 SHA-1: cef27f106aa8c90ac7a316a1cdc850d027d70258 SHA-256: 8ba1b193b29e1eba693b19febb4f5eeb6829e77e9cde52295b5be3984bfe799c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://leifs-auto.dk/images/file/28704463856.pdf In PDF document text
    • http://zhizhencn.com/filespath/files/20210919182300.pdfIn PDF document text
    • http://zuche0551.com/upload/file/jomeregorumujeko.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4bbd91c4b83ad6ba1551a4fe291ae4bf/52642196074.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/nobaxawobafogurebu.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/95069790411.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143a09a2beec---vowujelelazilakura.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/vawesukeno.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/8245790949.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/suxamewozaxareluritemibo.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kinevizuxurolajujis.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/silukabajunolonegijokater.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/tanusafobitix.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/13474401294.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/84693233436.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/18420439035.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ku7a9mglh81iudnq0r9v2ct5r2/wabekujasiwiboseme.pdfIn PDF document text
    • https://fultoys.com/userfiles/32353638412.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/65187323830.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/67175593701.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/13140015180.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/68779784800.pdfIn PDF document text
    • http://labsshop.com/d/files/54848270324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=high+school+grading+scale+2019PDF 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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 18500 bytes
SHA-256: d65b83a8913511dc4cac5770b0e1c769d1f5c4e0bc61953de8fd4d591700eb4b
font_01_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 11004 bytes
SHA-256: c42ba0090fce5b2f3f86cf19c27e286f57fca83f39224c3830996dd5492db457
font_02_sfnt_off00013c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1