Malicious PDF — malware analysis report

Static analysis result for SHA-256 9817d16205d301cc…

MALICIOUS

PDF

95.9 KB Created: 2021-06-28 07:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8536322e6f2e42c57c146ecc275d1cde SHA-1: 20cd9297cef70e60d9a6a0322e63d20c02a8ec17 SHA-256: 9817d16205d301cc809f93faaedd3fcc180c235a3bb1b4773fb425c0766a76e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a common tactic of redirecting users to malicious content.

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://irlanc.ru/uplcv?utm_term=animism+practices+and+rituals PDF link annotation
    • http://www.awakohchang.com/image/upload/File/9230817149.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/abc66e8d4fd8149e1574aa6f6680ec11/85387649976.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e597363a---71445333122.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31c2482910---22189665628.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/37d324dc6dc2518de4debd6cc3f7ee8e/belizeguzuwamom.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/63206008533.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4b6ebdd7fb90256447a869160b4bc915/jijagibadujox.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/96198db06016cfa7cf44fdaf94ee5e8e/popanikuledekeguwarujud.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/novasusedegitarigi.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/31793044860.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c4472df2c0b7bb46e7c4164797095911/woxuvizodojopobugan.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae72b2a6b---keturinatuluwe.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/dozumigitifigapupurilat.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507053459124.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sg0mbq68bmots6a1gkuqddlklv/36267820368.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7bc455b7e0f1004a56d05e643b545d67/tixilalokiwiviruwika.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/57497078273.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/20941998287.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608446c15312a---fotikafagovalulifij.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/71410057214.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/83177321352.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/lesemutukupopivefaziki.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074893b637e7---zutudobepusapitusaxareb.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949b96fb70---30733766641.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099dcc38f72a---41864362563.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160becd1ac31ce---33245854712.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_off000115ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 16360 bytes
SHA-256: 94bcacf12f26073a9a3511afe1631c3059b581d6f03fcc75c857abaade911f09
font_01_sfnt_off00014048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001585f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585F 10636 bytes
SHA-256: d204ec04d9d17361c2777e046294ffae7761518e91c3967122dcc07a08fc3993