Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc501ba840af71af…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5db75b8eaec8b6316366d2ed1171ecc4 SHA-1: afbf159e33ced4a00308fdc6b12b4d77a8dbad1d SHA-256: dc501ba840af71af77664508fda32980c7addab9e16c00862b93985c920759a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=automated+roulette+machine PDF link annotation
    • http://polimak.pl/userfiles/file/nabukesimodavojogukebuti.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf7cfbc2---93000773899.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iom9k8d4g1fate66ka153kodeb/senuzakatetuvakube.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/jovoviginurunubemake.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fbae3cdef43f04c1138dfb9adc87eafd/wunetaxobufewasawunat.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/sulowilubafirisegomotiwe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k5rl7mt97e7urlblqndggsun76/wexitopofutedege.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2e947b4017757197c1ff00af60c413d1/64496379352.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9ja8ob8v1u166nr04jhrkloglo/busaxuk.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vk5r6i54pu4inkqf8r8mkrp03j/suselifidenifowap.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087070882400---nimasewuxibowitulinabomar.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fab4ca32c---33422395051.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae11be172---lifareviwigawiget.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/ferekuriguzigu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607264db73771---21823530914.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc357d431---ranetalemalo.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/niwolipanumamivafinok.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/18482024934.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/dekasiguvuvuni.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b6ed348d2526b3f820d4c81f9e9d034b/nesamozavu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/83149907686.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5009589d1143c1f51494b339b7ca2807/saviriwurazusipul.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed743d048---waforuposotara.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba1b40c15---pajomupavovewinomive.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jakijapikigadubanu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/37f47898a3e9c753352938f606addb94/84242758970.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_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 10548 bytes
SHA-256: 180a0fe3edf44a2e2420788acae010c44c84640b80bf3cf03285a4bf5e5f06d6
font_01_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF6 16108 bytes
SHA-256: 99836f1e37af459a3347dbc3fd22201d77f8e61bf517b84b65860dedc0fe99e0

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