Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfaad5bc8cbca7d…

MALICIOUS

PDF

74.1 KB Created: 2021-10-10 22:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69df09f081376ff78421f0a1d1fdf464 SHA-1: 072a7ec68b2da1e2cb76ec59005f4f3231b7c86b SHA-256: abfaad5bc8cbca7d74cd30a5a9a8efb6547e89a3862029698e69228a5e843a4e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and heuristic firings point towards it being a malicious document, possibly delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=moving+and+handling+operations+regulations PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614df9e11ed03---jibodelome.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/noweruduxip.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wifagolinujujoputitinate.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/tamagalaworafawaw.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/73481100129.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/39003135319.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/60ae88042a38879437c6a3c7685f195a/gikibuvekimivu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/82c794e1dc6e1157ef0266ec4362d523/40568506606.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/fisaritete.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zoxural.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/52867218333.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fa0001ba3---84405198641.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/31065420422.pdfIn PDF document text
    • http://abnicum.ru/files/file/25549988463.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e148e1dd03988200aecab569a8569663/15212056638.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/rinizurujovikitikow.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/10209665185.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/kalixoveje.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/dugorajixiwaze.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/regugirifoxujodirupoz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615b1ec8a5ae6---24733847955.pdfIn PDF document text
    • http://potlista.com/file/files/8160226814.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7fvh693dvhdedd9kvtedkgt4a1/tajotozikirebaremapawasas.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_off0000c02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 10832 bytes
SHA-256: 912d7050003b2cba4c00521220934de9152c334491ca2ab837b739d77368c904
font_01_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 16516 bytes
SHA-256: ccfbd930c75f698bedd9982bb752af3fb2719967dd30785977a560f658dd5792

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