Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd160325a71bbd66…

MALICIOUS

PDF

93.4 KB Created: 2021-06-30 03:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8093a2f1288892ec695aaf62f93a686f SHA-1: 8adb8b41a1c7983a0934e13b92c9cab52b302435 SHA-256: fd160325a71bbd6672b5c8d5cebd138cea4ba901731650c69191e2e1637f02a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting it's used to distribute phishing content or malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=how+long+does+hamburger+take+to+digest
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0ajfr5b96sp23kt3dnvbntm8e0/nenomesolixizalivos.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c5b30df63b126f0d543e4daff0d5e3eb/wovusumaliwunagibeduvanug.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/86fb396021d0cedf949c27e3ea6461b2/59814516959.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rqr6up2f11hgrd921c1meo9li5/zuliwowubesuvonip.pdf
    • http://goldnumber.info/userfiles/file/77674664796.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be165d17277---49546678261.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada157470a8---72845353422.pdf
    • http://infrabud.eu/fckpliki/file/31766051337.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3fca211a---gonenilivuluwutesudune.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5903208c81---85723132139.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kqv1mbsl7oon8tuicmaq4o0lu6/zijijuzukeguxoxa.pdf
    • http://bularz-auto.pl/images/userfiles/file/97429465438.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rolmn1nacnj00454a3cccauf1c/67299633898.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/21d944b607b74858c74dcb937c458700/sejelalarixafudiditofox.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beda0c50f4---44848783959.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/vilipepudozob.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca7ac71bf---71324656472.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25983d667---wised.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c87f36080---gobufolivevogovobuw.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b587aa529d8664d754e7336bd8d66666/fuxetob.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0bb5e2454aa399526d5031ab3e984507/pagutamojaxevigixalefoki.pdf
    • http://aquatherm-graz.at/files/paweditumobo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e618ac66b48ee97102aa66bd19794098/tazikifaninemeruvoj.pdf
    • https://bhsbeacon.com/FCKeditor/file/potiso.pdf
    • http://brainbond.ro/userfiles/file/wezetibunaweguzon.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/pidozosoxozakapajek.pdf
    • 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_off0001066f.bin
b07f4fa08da469abfcf11d218879dcc78534068c82ca25852d1cd486c798226a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 11104 bytes
font_01_sfnt_off00011fef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16792 bytes
font_02_sfnt_off00013801.bin
f494e44194632218c2b62021099c813d32f35d06e08c0143cbeb2cf8aa91f8f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 18792 bytes

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