Malicious PDF — malware analysis report

Static analysis result for SHA-256 27abbbf2eadda0eb…

MALICIOUS

PDF

96.1 KB Created: 2021-09-06 09:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5561e1679de939df04333ab3cf2de432 SHA-1: 2d664122c25b2d4bfd2748ac7d1896b9668f2200 SHA-256: 27abbbf2eadda0eb777d7954760e9cab4e4f3d569bd049e4a26e645b7272eb9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2eebca4e4---674460412.pdf In PDF document text
    • http://hesexpo.com/img/editor/image/file/78577942753.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/82619b5c871e7198836db60c75cae481/gavuzoperutofoviw.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ab9ea7a4626a640c0b93d352274ab356/gupiduga.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/burinavolokinojevulota.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/fuzufenodaxefig.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1c018c70---kakobizijede.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/09a5038a846e4924d2f3c9add348c809/61519147271.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/detufinurawarajowurolisap.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210808_142625.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/75869876762.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/degaxixosozozaromenebi.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/08d2ceb2193fd4505ed7360f326d11c0/xezuvozidadawopaki.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/97566181378.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/006e9c11441db49a98958bacf498a6d9/sefofidonulivux.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16114ff79db0f9---tozuzodidivixogadovefij.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8mtjmkov13conjg0qvj1v832r1/57910153292.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea7c534fc3---95618043307.pdfIn PDF document text
    • http://hydrem.ru/images/file/nulufu.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/katajoxewasilevofedigipe.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072328dc813b---17198041368.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eb75284e5a82f94d812f649be41168f3/vejofoguvutinafevufulun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=communicative+language+teaching+methods+pdfPDF 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_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 18140 bytes
SHA-256: 3833686e0a736bb0a0fb2ae526999437b595684d1fa7371b9ee5315091d10e04
font_02_sfnt_off000158a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A0 11164 bytes
SHA-256: 659c15fa83f221127dd9ddc2b5c40e90623d3b89f29cbb4378dabe7a810ffaf6

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