Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bdc68cd4329118…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 01:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b040cbd31791f398e3b39ec9b027363 SHA-1: a9d1f3d34b9ee443410368177a2c2fa69d27200f SHA-256: f1bdc68cd4329118f3c9b0ea89e1e87724482b721dde6fff51dd4a78b096cb4a
156 Risk Score

Malware Insights

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

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 a link farm directing to numerous unknown URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of a 'watch avengers infinity war online free hd' URL, despite being marked benign, indicates a common lure tactic for phishing or malware distribution.

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/8e2d073fa6386cc27c56117fe91fe2e9/xigajunexavo.pdf In PDF document text
    • http://stagelight.pl/userfiles/files/ludov.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/fivevokujegoleza.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/34385563424.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0f99dhbv458tnspinc2vrauje6/vezokunejiferarekelef.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/wufamefususewasokevu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b6b4d32b0bcf2deab8c3a55a11cf1d73/25735808815.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/wisow.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/vinuninimegoxuvefelo.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/42034802220.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vokovigawaxisiwadagife.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/68291204888.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/didosewuvekojidikovikavox.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t7mduvvekv7f486dun37cmqeen/33688851686.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1a02b969---53021729048.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/nemiw.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/jozonusofedetudalolunid.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/25291674459.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/83922747002.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/31346574041.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zibekoxazawuruno.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/54081762864.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/51823855710.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/76349267653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+avengers+infinity+war+online+free+hdPDF 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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 17488 bytes
SHA-256: 89cdf211e656b844313f77c8c6e0061f058193c57fd3a2cd816c107f83ab7a21
font_01_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 11016 bytes
SHA-256: 941e821a3dd3dccc200166653a046bcb3a17e2696fb66fa7d2ed878cdc8eb8a1