Malicious PDF — malware analysis report

Static analysis result for SHA-256 8449bb1d96c7b3a2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 12:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9be0664e805ee3c166d45fab54fa0265 SHA-1: aa8517ad50b9194611eb9fdb8f5aa0f8d1492733 SHA-256: 8449bb1d96c7b3a2019f03faa90fd4198d0b8614a09dc1ea3531de928a954ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure to deliver a payload or conduct phishing, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=rfid+based+toll+collection+system+pdf PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lnkld8e0luf8lbv6qkkb4ln9j0/21276858543.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/52434324211.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/kipor.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1159591b2b---gabamumixavejalamesib.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/895a49480d66d290cbd6a9d3b135096d/47584295464.pdfIn PDF document text
    • http://etre-belle.su/images/file/647855809.pdfIn PDF document text
    • https://hagepoorter.be/files/files/mufobiza.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/fidojiporotuvupekarerex.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/mewitimugodajezixinojo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160918e8e6d416---majuvagovuzibutemeradi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xuvagakefa.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xemegawokupoku.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/j55seblp8uilhrtuub42uhmet0/34239611412.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/jilafa.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b4ea1239d3---gofotefef.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ldnge9ldb6fdiu7s6ukcoh3bc/12816058806.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sif9u94flceonccnm3m3n0okhm/33601115393.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dca483fd1---70653845907.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b14b9a544---widimovuvitumotaxe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608441e7c2529---gugixikosulopux.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b296279195b---59742235273.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///dusigifajazixun.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/96462958687.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/89557751266.pdfIn PDF document text
    • https://biocoils.com/img/file/75964661727.pdfIn PDF document text
    • 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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 10980 bytes
SHA-256: 7b82e06f6073ec39e474c91856fcc9f3bfeada75a1a9e0289ab7cc5e4303b8bb
font_02_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 16972 bytes
SHA-256: b9026c92ef90ac9284501ec508147bc61b6964dc57abd481e6adbe8e4323f6b3

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