Malicious PDF — malware analysis report

Static analysis result for SHA-256 04783a2e6910ee85…

MALICIOUS

PDF

87.3 KB Created: 2021-08-01 11:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6334cbe0821f86aa50dd9ff0cc5efc45 SHA-1: 0e9a3236a65b36876d32b8a3dcaf0a506fa68432 SHA-256: 04783a2e6910ee858b19d346927df01a4298f3ed127fb1120562e96d697bc2d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/6e7hkbu9v9b3rdg7jbpictcfi4/duwulitemunipakip.pdf In PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/33842705014.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/fajegulikemilepenaga.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2da24edcf4113f93e6fdb779460e7bb9/62973103300.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/34288180653.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/vesapofonetoxir.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/77970463578.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/42338169753.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160db291faded1---20635900456.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf17dc3a1---62598640662.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/969934d30b54c896dd649279542a6d86/zudizowime.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b678f6954b4f73f55137f465e4291826/pakanorofatigo.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/89218221455.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/18848484674.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/391193b5ae46fbe757cdb33e869652ff/nekitepijalivamexiveju.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/abde3401c0790c543634f2598d1f2189/fomozewonipapakuli.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c57d097f---24825404822.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/gometeju.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608834052fa15---saneluxiwokoz.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/50728751128.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/404kvl8erjrf8graboq8pv957q/81312863753.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gbbs8c4kdreqtm9q7u41h8qk1a/xabalavesujixuxejaju.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/jonosarugatozafipuxevuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=acrostic+poem+examples+for+hopePDF 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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 10724 bytes
SHA-256: a9045e676616d2eaf92c6bbe424d0b4acac9e8e5136c15df8ffb6795f73399e2
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 17236 bytes
SHA-256: 675d22554ab149454a0b52f45ca89d6f14bbd2498067001937efe737d341b5a0

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