Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4913660db7cf9d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 00:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e0dcc4735eb018c2792af9ad5e76897 SHA-1: da766e8ff21fdaf012b3bda2c4ca06de23a9f074 SHA-256: bd4913660db7cf9d3efe99182e62755eb7e3577b20b9e719540feb20e51511cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or tracking intent, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=shutter+island+screenplay PDF link annotation
    • http://palletgoanloi.com/img-dn/files/gonudisat.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d37cceb501a5806748a8d3b04c9ff2e0/wovum.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xejebojoletolugejosaxi.pdfIn PDF document text
    • http://benetalent.com/upload/files/69950497187.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/24094027074.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/70134529134.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/xavilulozetisora.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff71884421---kafimapebazabuwixibifo.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/ridedoradinumenude.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210912072304_1407837801.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bupizufujo.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/xobinu.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/81890220875.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gikam.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d028953e20---supogosotad.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25ce17ffc---66860409081.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/kaludotovu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5e27eb66---vuvob.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8b1149d5557b178f9a8d0ec7f9dcd4a2/detijugotifatogero.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109051644277769986hj3uu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/78174129662.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/pagenolinoju.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cd4e4a9c7bcff313d30c77019aac5da8/78653369160.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8d0c2c47a39e0b4e7ede997c9244d4c5.pdfIn PDF document text
    • 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 17256 bytes
SHA-256: 3c658eac5fe320ea8a7e7453c5518371256d3c4957dcd60ef1b3410054f0b83c
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 10780 bytes
SHA-256: e14244475f7a443ea476b369403dedd9009e4fcbf7cbcf94c821194e168fb705