Malicious PDF — malware analysis report

Static analysis result for SHA-256 38350d94fd0b6e5c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-22 16:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e682062cc88f6d831f0d48b95f9bf4f4 SHA-1: d816b2a4f4ba8335f399263c6975dcf9f13b2a6f SHA-256: 38350d94fd0b6e5c70c1eb5376e26151645f721f2bab3bd87ba416a1c4df4af7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f2f746ca43a682bdf0e7dff9a0429d0e/8623995639.pdf In PDF document text
    • http://goref.ru/files/file/73551048119.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6jl50459hnm6v9uak263uqbn71/lewilovot.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e4b230b0d---75245881682.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/57755124281.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/rasudibini.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/82028846513.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/56443848464.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/lexifa.pdfIn PDF document text
    • http://askort.pl/Upload/file/vanopaparixasuguk.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160718960eb4d3---sipozogujevivaxikajiwegi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b3fedb83a---zujisolitepaleten.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/mafat.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5f9f44455aa1398fab849f8fd1ba389f/60515912555.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/72001908637.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/71112884852.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/469b1fae0e40dcd69030d76fdff416f8/24819981567.pdfIn PDF document text
    • http://inse.us/uploads/images//files/togurewepusiwukeg.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/79s22udr0hj938btm2ahkrggq3/kodowabegajakegekukokip.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5ccc1bd6c4c48d8f6dad7b8e328acb75/toferat.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/vezujebisez.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/vokigep.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/bewivo.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/24489191455.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5adc18b44d6f6f1ba9931b692851d045/renawipetaxinena.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad301f73847---winipomevatolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=steering+wheel+shakes+after+new+brakes+and+rotorsPDF 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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 11024 bytes
SHA-256: bbc46ea6dcc6353a61528d417b70675303528e444117cd916f2e8d01dd889957
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16784 bytes
SHA-256: 969bf73ab071e63aa7f3ba779e876465c45c752a1759194ddb3896732a878742

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