Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd35e17207681a5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 22:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 193e9582181a597618ff3ddcce88efbc SHA-1: 0f0d0f4e62c30161c032a4ce72c500c782de0f62 SHA-256: dfd35e17207681a51e49d5f51eb63f6be74064bcfd03744b2748b9a8cf416aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477bb5bdff---nezorexogigiledorus.pdf In PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/66435637082.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/41859779277.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210723_9AFCDD0BAD80827B.pdfIn PDF document text
    • http://texmet.pl/userimages/file/dimil.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/judolopufujej.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/4936094762.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebbc2e5ab---sevupugifaxitoz.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/jazujugemigu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/35942318887.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90e624ace---zufefutov.pdfIn PDF document text
    • http://puisan.ru/uploads/file/59178440646.pdfIn PDF document text
    • http://jsdarvin.com/files/jirodafowolasefu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1654c3b26e---tidodowux.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/63923796090.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/modoxapusowadimogekim.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/24718312463.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24a1662e5---zuwogosofobuvamewudezaxos.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/mitenede.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756891f28ab---27000061325.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608440e697949---dadopamumuperusulo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9e0f6e8724e0eed068c321aba27cfdbb/fuwonixi.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tituroriruregej.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/xitonakunafasitubabus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sbi+po+2019+prelims+syllabus+pdfPDF 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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 11348 bytes
SHA-256: ab7ab6972cb95b87f3eb2177b863b5addc9905e3b7745bf9a7cf4f6c1a3ed1c8
font_01_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 17948 bytes
SHA-256: ff194598d999e789c352f771766b19379a5217f7d7decdaf7a226068f6fc72d7
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1