Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aac076b485130f2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 05:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16f10e5e77a273a53f5b4a5b8230b749 SHA-1: 0d0777a778e0f92b593665da7095b0b0e854ee74 SHA-256: 4aac076b485130f2d8699099470284ab5353e37eef9089ec2af966d57955545b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm. These links are likely intended to lure users to phishing sites or download further malicious content.

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://allytemp.ru/uplcv?utm_term=how+to+know+sdk+version+in+android+phone PDF link annotation
    • https://nepalonetours.com/userfiles/files/fanipajumafowu.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/tewopebobimabonoriturane.pdfIn PDF document text
    • http://vswet.ru/f/nazalagaxiwajesisolis.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e36e430c1---21804105577.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bosanifezawad.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/sonureke.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/618870265.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b537bd11fa---7665057368.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/pizewajufewabudigulowabe.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/larufazokaruzeridosu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/73d51a383f8b3f61d020bdf8a51a6298/baguzafabujezixokuj.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/98757683131.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/13782127690.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kekisutojola.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/jiramukesivekazisedodevez.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/85da0bec7ca7908733b4b4b6f89ba4a4/98703952215.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bevademot.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/80829344700.pdfIn PDF document text
    • https://coluer.ir/documents/file/jixazeworijutezejebo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/mupesokevipumibebagamedux.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/25711990922.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/11476509397.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613153ec6d771---62528689770.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vujidaw.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/87731258410.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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 16988 bytes
SHA-256: f19103743fcefb2a8d417493b6950a7614987a34a2e78d35069ea47e214e8d6f
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 10676 bytes
SHA-256: f63418d33d58d80baeea68fd7eee56123c061aefb8f021a066621a149b1d45db
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1