Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1002d775bfe74bf…

MALICIOUS

PDF

76.1 KB Created: 2021-06-27 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65c084ea19b7e374a38bd1ac794707f6 SHA-1: 167395d7a2fdbf042d2f6b3c9436ac8f143d48ae SHA-256: a1002d775bfe74bff5f4b679bd8998fad98c0387c8594eb7937f4fb64d5d89bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=cannot+meaning+in+marathi
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/149194erpbsabn2d2mpm6dgq9u/pixekajomugupuzogexerato.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jg612d0dchottoai6q3p70e4t6/bexulomasesefazimuzex.pdf
    • https://emmaushuis.org/pages/35234405291.pdf
    • http://brooklynsmokeshops.com/admin/images/file/57891740497.pdf
    • http://allg-gyn.ch/userfiles/file/wowusatijodojij.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/jil5qd5m6lvnh75mg3c2cgfa3k/tekimopomobewupezesow.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5adebebd795b957ad401080f035c3763/85273609027.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/hmr962vjb5v9dqbq4temj9ovlh/mufadiponiwuxas.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8461d98084---45677034639.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d2b9ea79854a297390f7a6fc876d062e/punomafunuvowudisuv.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3383cc899---63746890492.pdf
    • http://www.biotanika.pl/upload/file/26103755902.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/08925941bf0c3843295c1ef9ec75a215/pimekuripopubamobarebuj.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7d9d5a263---25221275816.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8cda63b3bf1e04439840be870dea746a/gupifemexiganipekikiva.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/33597634735.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/rijarozi.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/65671015584.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/22f58428ef03ebc42ea298a629ce70fb/muributovobejolarufix.pdf
    • http://stolizstekla.ru/userfiles/file/mugateretomabituxud.pdf
    • http://hgbs.de/userfiles/file/50523112749.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5lc8jgdr370cl2spqcjbch44bq/24552795042.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805ac91d981---jemuvemowowalewopemumozer.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9cfkp7fvn80ddf9huboictunu6/47328822573.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_off0000c7bd.bin
e0d2f3c9310fa3ec16ee2f7b450432608c681fc2fdda91e9ca2ba1177dc57cab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16492 bytes
font_01_sfnt_off0000f226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 16792 bytes
font_02_sfnt_off00010a3d.bin
3082562e7b029ee61955bd7cdfddc659400a7722f67eb8795c586969ce2606c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 10372 bytes