Malicious PDF — malware analysis report

Static analysis result for SHA-256 a134820804556fe9…

MALICIOUS

PDF

117.0 KB Created: 2021-08-09 21:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 650cd9c8c12d63f226a6f105e986c0c5 SHA-1: 427c9e72efdaebcb498be6c8b5abb943e2e95ff1 SHA-256: a134820804556fe944d1bfa3d18754988c5ce7cb63cfa204bb1265eea79d2fd3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mahnomenalumni.com/clients/879209/File/22637641074.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/545e86c734b07987a1a78ec17b533964/73359396868.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d0f3e21b0e75d6c29ae5fb39dbe62719/16075398780.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d814f2835c5ea277e3c49798c1aa8dd6/rataxuxupomigidojamatumi.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/4080140552.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/7390961821.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/38816127311.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/88678719518.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/63430fee830e8a2dd5c2d1810ad174cf/65792194405.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/vawurogelasimemapubo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52e719c2e365a7deed183d8b157bd149/pawisigekodax.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/80670071317.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607debdd9e991---vibawo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bbaaeb01f---bojalida.pdfIn PDF document text
    • https://vestol.bg/files/file/wisepewosopile.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8909bfbdb---84504014215.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/fcuuj152kclm310j9scr5bd7p8/tekuligap.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pa2dug4nd9895iir9klodchmja/xujarorofumazojazuzoza.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc64f4c79ec245cf8780df4efc5b302a/99023964041.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9f7d6181edc2aa1a980ea42cb6c38342/pitimizomubenosumek.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e01256f9d094228c00581b615c7cd33e/kitonurepikiguwuje.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/resekaraxavetuzun.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757f50a92c0---wimaxewituzazesagam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ikea+stuva+loft+bed+instructionsPDF 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_off00016503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D15 17976 bytes
SHA-256: fa2c17ab19b872660f70a5629d1f03bb73d82a23229e8bd1974178c7cd44bf2f
font_02_sfnt_off0001ac8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC8D 10816 bytes
SHA-256: f6948b06a332498e251a86a4274ca5d776ec2e7418bb8ccc3a1c8cd34e0cfc1b

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