Malicious PDF — malware analysis report

Static analysis result for SHA-256 79feee35d1ab299c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 04:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d3236787698d3aa5d832e38e6480dea0 SHA-1: 393007002e7f0e5a9a509a8d846a8daef995ee72 SHA-256: 79feee35d1ab299c34e1d4d4941f2885fd72564dc4342eef8fc9b1e6273c65c7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://kalikraft.com/images/file/sonosinowegonam.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bafajavaneginigonude.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98765727f---gajadizawelagurunabami.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076999763c92---kesupodunodevedujejad.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/boparezovifuwux.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sagosewademamota.pdfIn PDF document text
    • https://best-label.com/upload/files/gekokemusufibewesegax.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/budeduw.pdfIn PDF document text
    • http://dnepropress.net/files/file/7227295358.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/53507940304.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f32fdff0c---memojatexeguwufo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/luwoziwanakeresofiwulanuv.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b1bda213117742201c9af53c16917ba9/solonuduvarowaf.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5059fbc5dcb6d6572f7d72a037c54c79/moxometug.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/vo082ov4u9dp965ktk9bekm4pl/kiruwol.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/92776765661.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7083d9b9275bd45b724664d443efbbd8/75196138038.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/bimijetatij.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/46530715094.pdfIn PDF document text
    • https://tempegaring.com/contents//files/67569342784.pdfIn PDF document text
    • http://guitarenko.fr/img/files/radiz.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/jifoxid.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210822104350.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/47205154496.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/79240178563.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f354db4b---98165648839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=math+pedagogy+pdfPDF 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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 10372 bytes
SHA-256: b0514b72465f2b9b810194a925fce38d09677c60b164649ba670307319d4f2b1
font_02_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 17344 bytes
SHA-256: 2da3ee2f0d929556c828b486fc78dc78f01f0a392954d6792b241a826dfaa990

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