Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a31f78b7a7877f5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 14:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6656386987a6d00185573b7f895d819 SHA-1: 0d58b4dbaae3fc1d038ae984318607bae6e7ba50 SHA-256: 2a31f78b7a7877f53c6c6c3da86ac462b486ce25e4e40e0db75f6b7277626dbc
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the primary attack pattern involves leveraging embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=subtracting+mixed+fractions+worksheets+with+answers PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe53286fa---jomovemabewupififu.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/50150863419.pdfIn PDF document text
    • http://4bx.pl/public/file/92987284594.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/51150173585.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/fikizimevazok.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f20237afe9bd579ef7a2ba7a58265f4e/luvatifilazekujix.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/94610348389.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5be35bb25e3f4a5f623549e155380e49/konuvovanu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wekokigumawijinosuv.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/90323235880.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/42683321433.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2836a781e---11770717606.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/muruvese.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b20e0c5a8f746a322388fdec26b6b035/70747005583.pdfIn PDF document text
    • https://motiv8workout.com/up/files/wiwotosazonul.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/vadokipomosuzesex.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/zeravus.pdfIn PDF document text
    • http://deauville.ru/files/file/71464131021.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/3286005786.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b51a49fb2429526fcf73acf00356db09/34491738538.pdfIn PDF document text
    • https://vestol.bg/files/file/jazukorom.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/94159765143.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/ragobevuximizeja.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 11472 bytes
SHA-256: 26944a5d9a0c23467c03bb34cca7b5e584067c1cc43f927718a99048d217dc40
font_02_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 16264 bytes
SHA-256: 8f51d576f51dbd5bbd6cc8f4c23f95fdb9489831eb479bd944edc6ee4f8829a7

Open this report in the interactive analyzer, or submit your own file for analysis.