Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ed80f1c0643992…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 03:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19b7d5697706b9e271336cb82758d37f SHA-1: 2e96a9142363a40e2070138152f0b2a8bbb97103 SHA-256: 86ed80f1c0643992b420e02ac007cc993a7ab3e8907e3fdb8f94404ae97dd3c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reklamavysocina.cz/UserFiles/File/mevofedelatufasimonutesam.pdf In PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/naropurukevuxigaker.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/92357969671.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/44368797253.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/daruzagewakubumetimixi.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/30883448676.pdfIn PDF document text
    • http://creationart.hu/files/file/75157619781.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/54702807900.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/96a00e05e2f8ebcdd5f4aa57f9e3dd6d/30181217063.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xalijuve.pdfIn PDF document text
    • http://djapm.com/userfiles/file/9080266615.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140140b1df70---40872476875.pdfIn PDF document text
    • https://latework.cz/soubory/10720238590.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911030849.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b992baf4c---wusupodunizunanozoxida.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7ju2mb5sq09d553458rooqhm7i/zelugejomawamolekose.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jidukegejojapiduga.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41a29644f---24603070438.pdfIn PDF document text
    • http://namngonviet.com/user-/files/28732391460.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/67911809046.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vofixazasexutukidazuloni.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/nolebowuwinusaposevumabo.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/14638475075.pdfIn PDF document text
    • http://orem.mn/uploads/files/rapumuremaguvimivuj.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/sobuxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=c+programming+notes+pdf+free+downloadPDF 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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 16452 bytes
SHA-256: 54793eb3b5ecba17c2e30c68a9b74198965c682ab98af6dd012dc92bb9e04c7d
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 10960 bytes
SHA-256: f4291a4bfae4c580af23ea01e4f9b5918a3d1ef15873b2fca0b70999a817abd5

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