Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd241a3fdaf42c7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 11:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c4547460024d50c3b9b177a5d29a9aa SHA-1: e5b9f7b59ff69f903f60cdff251bf023920e35e0 SHA-256: 1fd241a3fdaf42c783cd5c627cd67a4c24d33d0d301221937c043130e5126bc4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/60b759166ce02f6b36896f69ac0e0126/fofetavukotalamifumu.pdf
    • https://combrooncom.com/contents//files/xijumojurobusiwolosuxemi.pdf
    • https://everestart.com/images/stories/file/32885501569.pdf
    • https://zivotzaokny.eu/res/file/potiwasokafekotawonokewo.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/un797e2p2er6kskbr9mc6r8p47/19935930504.pdf
    • https://ascinfratech.com/clientprojects/trading/file/27729951768.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ca932508---zorimekuwobibajibixedif.pdf
    • http://huiking.cn/uploads/file/040300312140.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ec0fb0a87310945c1a208c13234e3684/20032995422.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/gututoxebitikowezusew.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/nefefobi.pdf
    • https://uclerbaklava.com/resources/file/rolopuwumivujasewobuk.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/21931d0be729e1a0b370ff4738a79f82/39215336756.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a11016058d---fuvebusedaginujimivudosad.pdf
    • https://monyetmesum.com/contents//files/naxekujaxifuga.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210828_F1C840AF0A072496.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/miwubizolasazenivow.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0f752549d2d9949ad4735f19feb53686/gepido.pdf
    • http://thingsantiquesla.com/userfiles/files/51988928840.pdf
    • http://orhs76reunion.com/clients/30721/File/jupobegiminazonevifir.pdf
    • https://acryl-bg.com/userfiles/file/37449080609.pdf
    • http://uci.ir/userfiles/file/mulogo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=clasificacion+de+la+administracion+publica+y+privada+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43b.bin
1fc0aea5f67a53a1c87969b1db49871dc79bb40babde1c026b3c8fa5a6a465ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 11232 bytes
font_01_sfnt_off0000ee56.bin
3158ed283fdef9dd2b2806fbcb6d1f4ee9449e1538405ef5965d5c68f45cec1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 17720 bytes
font_02_sfnt_off00011abe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16792 bytes