Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa31fc7692a2ef53…

MALICIOUS

PDF

81.3 KB Created: 2021-06-30 13:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2405dda25ca98b8dd5c6da6997a9e288 SHA-1: 896a462f841aba2b6ed232fc812be6f7fb5554d2 SHA-256: fa31fc7692a2ef532f6a66c8031051a31c4cc22565d28614ca5b37d498f9e80d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The structure suggests it's intended to lure users into clicking through to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://abwingscolley.com/uploads/files/zomutixebenaporofo.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2fku234tj0hegjjsk9v0ploble/zosilikoxoxirogalimegu.pdfIn PDF document text
    • https://altbuket.ru/files/6649956609.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4dc9e942---zogutagijakiguxafuvomar.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087bbf2ac682---tefinuberofawusoni.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/60039068518.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/sitemunenejam.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/55ddd6e0454c273c2eb4a48bcaeb2a28/24219727959.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac77c9d95f---buravok.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/ziniximik.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecf274632---60884363481.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/i9e40bb283196qm08i42mricf7/fagutomodosusinonijuze.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/84539281400.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/9vf5kg71nbqnrdeq5gefksjaf8/tevedawonunovuvizib.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a91f2ac8fc47bf50e1875567c87a2f7b/bikejagekurufesotewap.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7b413ba50872e4d2f90d70de0ce38c7d/7574996788.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/sumudujazaveve.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899a8eda8aa---29861555060.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e762efe5---92824831412.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/kegapizo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a459c05b2e0a3945ae488344bdbbba4f/satanipiforojezerotajeko.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323af291fc---29037912845.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76000173783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=isotopes+isotones+and+isobarsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 19196 bytes
SHA-256: f8ed5defe2db1eea68ef44917c3d162a063216e21c30d9c19abae2b80ab77eef
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10432 bytes
SHA-256: e5e93aebbfa80d5bac186d0739e6e5cf44467d0edee2e71ac620ec4e542ec227
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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