Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf31a22e214f149…

MALICIOUS

PDF

95.9 KB Created: 2021-08-25 05:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6be44d5f43850cb79d812e332757c59c SHA-1: 8dda48ab576b64e3ba39fae82462fe420ecff0ce SHA-256: adf31a22e214f1493f47cc5e97beb7503d1d912b959c9727ed9b18a1d2fad755
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm and compromised CMS uploads points towards an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3df99d984.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f83dbd818---28316233028.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958b3bb3e6---79948900398.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/33d36e3c10b078d954b44bac7b052c91/30337825337.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcd8073de---fusuresudetovox.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/40376186418.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/bugusezafi.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/legisowaduxaxusuwezoteg.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/m13i4m0u725oinh8rdo2gashf4/92951108066.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609075b975e3e---donilorogogibabijafigobok.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/21804569755.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/48079844840.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/20049962824.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/sejukesedexenelotijutigub.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/66647513816.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/dopetejukigotaru.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1c52ab1d89b29663ce8bc4a43cc72eff/kibukutokilusu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160928ee5bb5d7---dajerolovugif.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba0607e55---disozazupovamufevilewatig.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fivoze.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/wadakezadarifalibeligi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e6ghp19brrqvm8c1n410oeievs/8423804352.pdfIn PDF document text
    • http://dnepropress.net/files/file/xinabavavabiti.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/mewozululetipewot.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/vazaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cute+baby+girl+photos+with+a+smilePDF link annotation
    • 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_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 11064 bytes
SHA-256: 78b0b33333d109bc3248903f7086d1c3f349c2965181dc885a1ba70ef3d6f478
font_02_sfnt_off0001449b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449B 17076 bytes
SHA-256: d4de9d2b3407f47c43f6aa404a7d5569a28509f46edfa3f82616b2169926dcd7