Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14423c5b6a708fd…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 10:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c1bed8b830789046a588f2bc002d562 SHA-1: cfefcfa9f3970f84a54994d68389e401533f5c80 SHA-256: f14423c5b6a708fd5d6785524f811f90565ac1c80b4cfcab4f1a048009a3d08e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=rdr2+perfect+cow+hide+crafting PDF link annotation
    • https://tkquiz.com/userfiles/file/17454897286.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/istrd1drtr9684shhegdre0356/xafarewovafidekapital.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1e68bb2428aad8699f68c76ece7881af/zepavejila.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/13dvmlimrea9n6jitgs6vccf82/serovuliwebilagofe.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/42543607346.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/65064116047.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dakoluvemok.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/m7uvmimlnt6f63325i8knd0efb/vunuluwikunafozokudibabop.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/85264036124.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9506b2a9a---47783821919.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/66550333302.pdfIn PDF document text
    • http://poiskvod.ru/images/file/92560123478.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/35f835c1f39bd47652c72322768d3052/19632345582.pdfIn PDF document text
    • https://serka.com/serka/upload/files/89559294127.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c4568634---jaxatogukezor.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mubatepirotejupetilusa.pdfIn PDF document text
    • http://12shio5.com/contents/files/89247441594.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2107151517379138512pmc2.pdfIn PDF document text
    • http://brukbet.com/user_images/file/vubawejaxik.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/jufetoderonavufefelob.pdfIn PDF document text
    • https://x-software.cz/data/file/57118455739.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/81107224995.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0d51c1f05c9340f27043add48cd2c444/3356163817.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210614184523.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 17252 bytes
SHA-256: f3d077b98bfabbc624f4c577df8f0d02a3088e156faeaa71f1aa0387fcad5b9f
font_01_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 10936 bytes
SHA-256: 607c64eb537571e57c5ceeeeb17b869fae6ca72d1991f98c86fd1455594caba4
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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