Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfa12ccb68fbccb…

MALICIOUS

PDF

96.7 KB Created: 2021-08-18 21:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0709103dca92399eaaa6ed4de9199174 SHA-1: 98b6b6dde49fb38043e8544c21aed1143a32bd37 SHA-256: 5dfa12ccb68fbccb8af0245c45ea2fc7351d1bfec38060017c9a96acccd473b2
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coluer.ir/documents/file/85340232694.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a573ba7f3---zalorefa.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/nurixapogirejafaduxube.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/xeken.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/sofusaniw.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/sojiliwilovupati.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5b70af6e47d70d52be864ee9eb15a5cc/palakosevovelolejiz.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/lasugoveba.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/22513529336.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/xejojozunebomuropofafur.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/55978402718.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/mapubexikejev.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/losenavalet.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/tisolemigalopigur.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc081a6aa---66539673011.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fb48aa068936df60553092a2e5d49a62/28919605788.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cd0205aaa9c6d0bfe181cab4ce7af33b/gugoxomukatuzorobaliv.pdfIn PDF document text
    • http://yuha.be/_files/file/porefoxelorenosugegud.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/80336258725.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gavirixajoluxawo.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/xumigu.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/32961987258.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qu1vpe41qb25pf258vqq874460/34790505396.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/23410919706.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/55564046621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=clash+of+clans+private+server+apk+latestPDF 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_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 10768 bytes
SHA-256: 4f4b1d44ff34737f17719e29b73b4509ef4e877136932de753886d0f98a38fc5
font_01_sfnt_off00012b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001432c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432C 17812 bytes
SHA-256: c6c45386be234d3f4be0969ec0adc6db15b20af14b49870a4c97834cc76a9b08