Malicious PDF — malware analysis report

Static analysis result for SHA-256 652453a38bfd8024…

MALICIOUS

PDF

88.3 KB Created: 2021-07-29 17:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43363b65f7fe9141d854bb5b0f9adfc8 SHA-1: d04ef2a3ed3e8fcffdcd3efcd2647517c3b620d0 SHA-256: 652453a38bfd8024a2e68eeb7545affa94cb63756fd1d2b92509720eae93de7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://daphongthuyhueminh.com/uploads/image/files/45474418364.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0449f0e56c---fuxotewo.pdf
    • http://cristal-in.fr/userfiles/file/siriwixafezibimusufodak.pdf
    • https://globalmediaminds.com/uploads/files/95824250484.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082eae4c4077---sizurazisuj.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/944fd2lp003vc80n6qb6tfm8ge/farozolig.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84632195ce---23265539611.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/rajekoragobadepis.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b52446689---bafofafogogitawulaluva.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160806d39a7aff---sotodorafinofosoro.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210727_C600BC2B2775ED77.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e8693ea43---solawaxexagamazofefujuwes.pdf
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bg6dmb8auodlmr21j2o71f7g7/wurovevewabakudubovixidos.pdf
    • http://akkoryazilim.com/userfiles/file/xaxuxeme.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/filfk76pig248asauichdd90lj/besuxufavakunemexibav.pdf
    • http://banquat.com/userfiles/files/27768757257.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f74bd3bfd4432971bd27b683f74b093e/loxulesa.pdf
    • http://jyjwqj.com/uploadfile/file///2021072811400577.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c22e246200e---xitojuxirukuzowavefuf.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/111438d060e3e3363c5fea7e479b6e5f/losanafuwufilisevosu.pdf
    • https://laps.pl/userfiles/file/47444393791.pdf
    • http://asupuro.com/user_data/image//file/radufatetevusefimapezu.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb7fae7da---gebutogop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=asme+section+viii+division+2+2019+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_off0000f513.bin
cefb828ad78954fa7975f89bc04307b23c8eca390610a5dd3eb7a56b1d60895e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17128 bytes
font_01_sfnt_off0001217a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 16792 bytes
font_02_sfnt_off00013991.bin
6eaccff4a76c6cb6b7e8e3ac730074c8db36fde0687f1d71c0c60fedc179912c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 10980 bytes