Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9eb90f5ef3396a3…

MALICIOUS

PDF

88.0 KB Created: 2021-08-18 21:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7f352acb6cfb78f4e600b89a85736d17 SHA-1: 255873048063412ff48de6c5ba62d4fb6a123c2c SHA-256: c9eb90f5ef3396a381b9d4075933b904482e46894c99c7a32030b5bbced82736
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of a URL with a 'free xbox live gold codes' query parameter further indicates a lure for phishing or scamming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://shinies.ru/img/lib/file/luduxigagum.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-23/20210523130258994896.pdfIn PDF document text
    • https://lemanssrl.it/file/jonoduxekozefurefibanedad.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d65026c29---80243836459.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117af69e97---zojud.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c28df7ec4d6---bebuwusuzapibubutokijos.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6jl5svuocrrur31nesg8b274l7/zibitixotirajeposav.pdfIn PDF document text
    • https://unosms.us/userfiles/file/33182733172.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/88ff237775e300bcb972973c33b61ba7/52613388725.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/nowudelavotiborifabadi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a703f78fda2---fewakesizibawozunepikeda.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd01dd81230---22198494684.pdfIn PDF document text
    • https://beaszemin.com/files/1914746174.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b904fbc069fc64d795d1dcaf41e38a55/82611235212.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10889cdbaa---jekaruvirimifebalip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e25fae21e25---8892273746.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/29738707548.pdfIn PDF document text
    • http://toonesk.com/upload/kibupogadoxa.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41c91eb8058e763cf302ae2fab6c93a3/puzowefodobow.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/wepilefonegijisipakupid.pdfIn PDF document text
    • https://elemonbg.com/Files/File/venitowepufuja.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wasedujinururezodilovir.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e28daa52c---nemelinodarexofil.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd0576035---sajuzokafupapobagobex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+xbox+live+gold+codes+no+survey+or+download+2018PDF link annotation
    • http://bit.ly/2DZSePtIn 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_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 16764 bytes
SHA-256: ff22a24a1786b94c415cdc0e606e59e7ac8b99e360b553554c4f266b57bcc632
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 11536 bytes
SHA-256: 8c4c9e41c3c4378912b9af632e4fbfd36c5e21ce8046e9aa96fb8bbc14ec190a