Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55a87e6747935dd…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 18:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6567bd9b21716d11a48b790a889fb1c3 SHA-1: aba648e124775e7b20d012083be50e44cf42dffb SHA-256: e55a87e6747935dd4475f5aaf613f69d63a0cdd4c53670582dcfb8a98151adb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to facilitate phishing or malware delivery, likely through embedded JavaScript or by redirecting to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=hellenistic+philosophy+of+mind+pdf PDF link annotation
    • https://dorfadvertising.com/ckfinder/userfiles/files/nufesenuzarapat.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e6474a1e---355285456.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/02b5fe97d9d99a5a41785c064c301a48/noriza.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/sibaj.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jojubafon.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pekizokivapewube.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/23282593412.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kumumibowuvomubefidit.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a045e45ebef---91037863357.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9d6318571e16034ad1ba128b957c6744/fedawuf.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/74245716532.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/79890331635.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jadamesoze.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/57494229507.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/1857856617.pdfIn PDF document text
    • http://saktigroup.in/uploads/muvabufizojuxowopo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852907042cf---rekekaj.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068a6e08493---41928531052.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/tujigivinusolitiw.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612779110e76b---zagibalona.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/u865qsl2kigi41urdevl52h4s5/54403982065.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xuzegoxikubinagetuxodix.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/54791834075.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonipikin.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4178c47224---zudubugoxuxuvatakatakoz.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_off0000be8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 10728 bytes
SHA-256: 56a017e16ce9d08cc0b55c309d1adc8112c3af467d905fa43fa258a7259e0402
font_02_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16804 bytes
SHA-256: f08fad7ae905ca47b3566b5f721916a4031cea5d60c9221ac724cc78f9b1a5c0