Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fa7818ee0fe9a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 21:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24e054e9a8ec9625cbe4fc9c3b482c11 SHA-1: aab7f4261b4db487a14af552d8afb761dd042863 SHA-256: 528fa7818ee0fe9a5bec41a5816c5578f724ae9f09952b0adfbe752e388090da
146 Risk Score

Malware Insights

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

This PDF file contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ClamAV detection and heuristic firings indicate this PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. The file's structure and the nature of the URLs suggest it functions as a link farm to further compromise victims.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3138

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/4sgm8joj5j0nldgmjbo7pnpdaf/zewomibi.pdf
    • https://watertorens.nl/userfiles/file/gatinodukizevozupalux.pdf
    • http://www.anclupnapoli.it/userfiles/file/77392956427.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5a8d4a47ccf53fe02654f555232ca3f6/luguto.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4a18c827e1e14e4147fc11d73de49d96/suxilel.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0fbc7facd1cc43ace36337c3acdfdf37/36893455873.pdf
    • http://keralabiblesociety.com/fck_uploads/file/95330859290.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2s10h96u1aiouidieccp1jnvf5/74478534318.pdf
    • http://goteneplast.se/files/images/file/95864550118.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l67pn68tk01n5t0o1ld0jgsgdf/zigubireni.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/52246934302.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963d4d58d31---51866984036.pdf
    • https://atlastoursntravels.com/userfiles/file/sevogodazuxedexorikarupav.pdf
    • http://malabarisproducoes.com/arquivos/files/64262530884.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ed1a84f3---nilonobekedirazapoforis.pdf
    • http://safiorida.dk/operatori/userfiles/file/lezer.pdf
    • http://18554080.com/userfiles/file/43518186149.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/pumitasuzafasedape.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ce32416069a9e0ae7d8d27441daba09/vakigupagaresijeb.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e0cc68dc---jutomilulirosebex.pdf
    • http://taixingchem.com/uploadfile/file/20210812020307559.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/12120982790.pdf
    • https://rumusjitu.com/contents//files/dutupixitusopi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=humectant+in+food+pdf
    • 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_off0000c25d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC25D 16792 bytes
font_01_sfnt_off0000da74.bin
28e7d91b99033baf9f3fb0a570ddb5c985562024dde340c0166225b9bb079edb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 10556 bytes
font_02_sfnt_off0000f26f.bin
ff9cfe9e269cb0fe1a81588a01f11d5b7519d91451ee08ba9ae50006a2262af2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 16076 bytes