Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49194c32aaca8b5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-27 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b550d3850a7088010b5aea789d49f6a2 SHA-1: 3197d6533f3075635f16a7632865c782d27cb0af SHA-256: d49194c32aaca8b59a469e239994abf79bc46996d3af8ca487b8d15bb7596b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to disposable hosting and compromised CMS upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and link farm detections strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=cracked+games+for+android PDF link annotation
    • https://ingatlansos.hu/images/userfiles/file/95568012821.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16151829a7eecb---991593582.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/pewaxazodisip.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/jefutute.pdfIn PDF document text
    • https://gtpoznan.pl/cms/files/file/nelitaxejiwepisosuravune.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zezetoxozupufa.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/40694495959.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/deladenuxaxujibetis.pdfIn PDF document text
    • https://icbacademy.com/upload/files/54801349212.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/54117706325.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fukekaxejarepuvese.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/pekolewajimanomeduzogen.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/346e3f6dfa53108c727bb6df42f0e60c/73182115596.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469b85afef7---87621343687.pdfIn PDF document text
    • http://knauto.com/upload/file///rotuvegosukanipadugef.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/87814524293.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161487fa5a565a---vupurolonabi.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/kenubebolitedeworut.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/21508344797.pdfIn PDF document text
    • https://motoralbini.it/files/file/zitizoxisiv.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/42084809642.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/zerobuzajurunazilup.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/poxufuzo.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/18894146036.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148bed152e64---jegobomikexixeriromovaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F6 15344 bytes
SHA-256: 0cf4fef272b04c787a3d02f139619fbae4d0f25cf9d53c6bde49a711dc6b3f85
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10800 bytes
SHA-256: 282dd0a7f9a0fb80ffd62657496777e6e042d9e6d2561c68c70e65434b3c24a8
font_03_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 18504 bytes
SHA-256: 4e9256c3a3e1211d54923a329cc0ae1b9633495e3e43e049462af9e8b1e7ec2e

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