Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f9dd6ffe94ae08…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 17:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8aae72b3dc2b98315673de64b54b9dd SHA-1: e762cc330c5fde001d1b5d43a3a49504637d5550 SHA-256: a6f9dd6ffe94ae0843758d6b2859cf3472798dc67a9cc41811c0a029b50c0f70
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further stages. No scripts were extracted, but the presence of external URIs and the PDF structure itself are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ikima.fr/uploads/file/62454510324.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3t1iiq21d6ai070t6i41rfab5/kokebalosut.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rlf4r57uukapc759alrvgmaacb/72707044477.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16092112fedf0a---lutonupurimusane.pdf
    • https://lawyerupsmart.com/tempimg/file/fajofiwuluxigutulaj.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c881b68a8f6---98599971014.pdf
    • http://acpiindia.com/userfiles/file/79245242358.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a846632f676---konafasudu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/de296c8dd8fff0b1c2b9ca14585f92ea/webopenofokavikafa.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160799f2032652---fezemetitofi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b477c78d584---17298645398.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbedb7eac---kifez.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/92066708834.pdf
    • http://rydelko.pl/userfiles/file/10015220216.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16080660a39d51---17316113018.pdf
    • https://aimara-bg.com/userfiles/file/84957145784.pdf
    • http://edumedcare.pl/upload/files/garuwamagozedi.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sp0cuot9jlgnag1l51g3ot8ouk/paronubifosawuminomi.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/49030278799.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e2b68783dc95a6279ede14b1197f8d7/guperidafewomalabovawenid.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fodozobinuwuzebirik.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/14n53mj5rg9qks9ujk7pnanpj6/44216297124.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/egr8nktooctvlk0eqdsgt6ho11/11728060786.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=schizophrenia+and+dogs
    • 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_off0000fc92.bin
072af7ec41f662bd46e34e075f33015aedd52704789d6ea795099b367a894dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16716 bytes
font_01_sfnt_off00012818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 16792 bytes
font_02_sfnt_off0001402f.bin
5bdde4c07ea2983f429143b71edebd53da312dd37675e82ec3106fa956991f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 10784 bytes