Malicious PDF — malware analysis report

Static analysis result for SHA-256 11add178696d106d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 17:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2c5d648dd050a60b53860e78007a351 SHA-1: 88c4fe4dac2eeafab6571de331d526d8d93aceb3 SHA-256: 11add178696d106d9dbb27e4cdae551cdf56a44858ea17542a69d06e6be6e689
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for a fraudulent purpose. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://myappartement.de/web/editor/files/gifijaf.pdf In PDF document text
    • http://formpart.com/upload/ckfinder/files/7402242954.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/besitedebifabopizawozax.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/89999212671.pdfIn PDF document text
    • http://koala-al.com/d/files/nilirekatafeludaxeduro.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/2615738504.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/nununufefive.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/sopedizekulebipudufakeka.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/35461217650.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411557e21bd---labavudi.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/54870032988.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jopupewedimisidosofoxup.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/9681619183.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/2499847456.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/pinulevelugof.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/96305589885.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614068786ac14---32875323356.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f76piio06gcjv0dfihdnteuk3e/90997942811.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/fobewotike.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zadugisuzaf.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/68799403363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+android+9.0+piePDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 10792 bytes
SHA-256: ae916cad296d0594c12e5304b896538c9ffc9aa35b0452ba7413cafb72e699d0
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17260 bytes
SHA-256: 13e47013b937053da624c1436a08357b1697986b537c756d68ae52d1695c43aa
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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