Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd71874bb0693751…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 03:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 685dd72fd07bf9f342183a1e78b6f525 SHA-1: 5e9734c7a9acc0246a072451ab69d8ecc0cc4d06 SHA-256: fd71874bb06937510f0e3816e99d425822abe82e3ef6503a8c3f8b4c3e6279a8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and a clickable action triggering a download. It contains multiple links pointing to compromised WordPress sites, suggesting a tactic to host malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=table+layout+kotlin PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613082249496a---fekebejosozirozub.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/wunoguvegepugobune.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3561100688.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tiluxon.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/19019092439.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/59324346227.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/88062614226.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/8209320826.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/zazibapikozomin.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/vinolebefipuluwaregegufil.pdfIn PDF document text
    • http://charontrade.hu/data/file/xusabizutodo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613267fcd98f7---mitifu.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/wesiban.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/58144316603.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/teluwazujaresajiwimof.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/52159822054.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161410f6dcd6a8---xakokidasemurovevevi.pdfIn PDF document text
    • http://gazetavk.ru/img/file/fuzunareralez.pdfIn PDF document text
    • http://geasit.it/userfiles/files/sawixizubivejopelerow.pdfIn PDF document text
    • https://hobbypet.cz/files/file/pagifukopabora.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/59278668709.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vuxabuwofavibe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161446692e6e6c---92840284655.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/fidibafiput.pdfIn PDF document text
    • https://la-klamm.org/Files/files/63808815112.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kepekokosekepunusiwo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uaif5n55o5rs1cs6gb1rfnaug1/51746799057.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/52853131691.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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 10244 bytes
SHA-256: 7ae8b7f8e27897d974e270e79ab96267fa4c6d707796374348d9a6c9e4ffca6d
font_01_sfnt_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 13952 bytes
SHA-256: 66f3a42b69c363bde2dd03eaa987e78438199d66c06832a55c6cbfafe054527a
font_02_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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