Malicious PDF — malware analysis report

Static analysis result for SHA-256 120b2195233c2b82…

MALICIOUS

PDF

106.5 KB Created: 2021-09-18 06:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54aaf8ba2b40ef05d1336468e23a8ba8 SHA-1: 05a575968f0367d7f257af07797c5f47b7b811c5 SHA-256: 120b2195233c2b82bdb4901a51233026b56867f260d49744d375ea965b2a84cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, 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 primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=polygon+android+app PDF link annotation
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/kovisevifategojowira.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210903205425.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac189e1ebf---xowakejobemafilidiw.pdfIn PDF document text
    • http://chromavials.com/d/files/lajilekidatu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ab2e1a47---lipigijovixin.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/pinaronuruxese.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/pexaz.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/99314615806.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/34665085371.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/wulitaluritupomozaz.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/kumiper.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/dojojupilemu.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/23656940764.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/12512988152.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/farututenitabekajunivoxa.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/nasetenuxi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c98ce31062fcc56236d35f3dd1216363/makuwoxepibukewozovawem.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33dc7f1753beca3fa8da8e17c736aeb6/zigodaledazigafugirikal.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/worobadirevud.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc2f138e4---61344277985.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/90779687510.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_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001532d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532D 10284 bytes
SHA-256: 4b5ab093bf1a762443de6ee563db4ec656b2e230df5e2581f1e6b40625f23c65
font_02_sfnt_off00016a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A26 19000 bytes
SHA-256: 872c7a02aa33aa2676c59447fddb553d7c1ba7a078257df9f7b30176419def50