Malicious PDF — malware analysis report

Static analysis result for SHA-256 480624507bd93b12…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 08:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4bd81ae3181599a811f67476bff4306 SHA-1: 78cdb8cea052a9a45fc98d46ff33c39c502a212b SHA-256: 480624507bd93b12ae9da1c39598c4a7ee3e5b774d3088140b67e7410b64ada8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mzlpro.com/web/img/podborky/files/48839194695.pdf In PDF document text
    • http://truhlarstvisollner.cz/data/file/54975690428.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/52792347374.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/xokudata.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/sidanosiwenolodusuzuwi.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/60479564787.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/21386636136.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/98327284756.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/marejamuj.pdfIn PDF document text
    • http://jarosi.hu/files/file/12810646428.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/98693059128.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/69531258666.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/8819002837.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb054c9b5e---dotogewolesusida.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/sijufoxo.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/zileriseragovuketajoxe.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/kirenosugo.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/34102470263.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dosabemimif.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb11b8cd1a---budebezuzemo.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/walamikireturof.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a71c6121---38660016931.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/svci9mnbh5ft3s7itmgdmgsk9m/debimadipugezatujefal.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/494762775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2005+peugeot+307+service+manualPDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 18324 bytes
SHA-256: 3411a6e424db99f8498b9a93e70b2747bfe88d942924c65a74d79b744a3b27b1
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 11384 bytes
SHA-256: 4118a80bb99ee76addded93d4536b85da5de43076ee82bf3947d8fb0ff75eabf