Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60687be16f0e365…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 00:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49c4179d68957113ef72876ef7e45be8 SHA-1: f7961ec1d33724b32dabae761120a44512ec7369 SHA-256: e60687be16f0e36596e95bcc41279949a9f5dd5d500ef62268cfcda24248537b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/61971a87e97c2f3e879992739e89a0db/lulovafapokidifamaludod.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k8fmc52h6kdggfuj00399dmm96/xivetipisem.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/sewosunipazo.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/2502199850.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38404889122.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c780661f18---26630446879.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/videdowuwojevosokazilut.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/58364505692.pdfIn PDF document text
    • http://iltorg.ru/upload/file/6070864068.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21032c75b---kosuw.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/53681232547.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/wekivegufawetawilize.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/lalavinefotiletezuzirepol.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/18416264459.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/3533491757.pdfIn PDF document text
    • http://naucseto.cz/storage/kemesobapizo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e71150e14---xikibu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a6d0b32d---97876391570.pdfIn PDF document text
    • https://digireg.lu/upload/78538968779.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/zodibidamogulafukig.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99ff4b739---71811175682.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/46197255964.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/t67jpt9pfbeo8b4rqir0cq56fr/fofusokupudowatedida.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/27748851415.pdfIn PDF document text
    • http://www.moyekolodin.com/files/50155903507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=conjunctions+exercises+worksheets+with+answersPDF 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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 10824 bytes
SHA-256: 6609773d85e2b6a7dbbaf5ab805121a42903aea6b774094bc1e31dd694185a6d
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 17104 bytes
SHA-256: bda8427300b2c6dc91cbd0f62f5c2d236b9bb1e62fa3bcd5c7c197d84ae73b67
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1