Malicious PDF — malware analysis report

Static analysis result for SHA-256 173202f6c90c4dac…

MALICIOUS

PDF

86.8 KB Created: 2021-08-25 15:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 805b13f33a6640147caa095a1f595b20 SHA-1: 116b794f830f5009483460a1289ad43a72bc3af1 SHA-256: 173202f6c90c4dacd78f0eafd3b2ac147efb9334889a9e70ea9ccf2d7ea09e94
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to facilitate the redirection to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 http://citysuji.com/ckfinder/userfiles/files/12476499771.pdf In PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lajikokimowesibi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f238e3013f---movub.pdfIn PDF document text
    • http://klinok-saintp.ru/files/31001463260.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/35597015600.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/vudidujovanim.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609abffd09c27---zefasetijatumaxun.pdfIn PDF document text
    • http://splogservice.ru/content/file/lonedapifizunexasopop.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/m5nst4g4b8gvfmdgu4n5evahvk/97467830553.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nuzob.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dfaea7364c99b16679442f042f3df4b8/57591898254.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/aaeb8d836727c6ab18435ea2e250b84f/96340580649.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a7qbk3te2pfgspcn17jl2dcccm/95531445656.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zogasulom.pdfIn PDF document text
    • http://hodori247.com/uploads/files/87472547702.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03a282170---22031757155.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/lorefurugo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c3671e4f---88772866772.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb723f8b9---monuruxoke.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/lexijiwemunobenoxafosu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/on35atu9k68e3hhe0akq05072u/zevozuxavenazoze.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b553e45429---vigoduvozinidov.pdfIn PDF document text
    • http://chayka-svg.ru/files/nexiguwovut.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9fe3ce4f---54824466521.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070814c8110d---zakijofuviwojabonewa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/utbskvputvnbjmr585hmbkprio/18880943243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=roots+juice+barPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 10488 bytes
SHA-256: ce5a9efbe20fe055da9ac05733c52b607122473c69d99ebe8d53f6616c1a8e0c
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16508 bytes
SHA-256: 769942884e4d381c394e19081ee48897751ba3127cc30a320accb1ac0b98b9ef
font_03_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 17708 bytes
SHA-256: 6bc7cded300724ac560155eca1d2bcc78d5b109d0b5c4e5a716c03801882283b

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