Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f1460a809ffc94…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 06:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82b4835340318a9b86afc5f837df9a7c SHA-1: 1bc814fc5d83a1dfb81d4cca31e9779f2ea1d369 SHA-256: 86f1460a809ffc94ef459fbc85d83e8cad0686b678edefc1bdbc4cb06ef7bc21
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 trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

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 https://portofcrotone.com/dati/upload/file/jijuxejudekokolem.pdf In PDF document text
    • http://asqcert.net/files/files/jagefiriwubatorutoban.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfdb120b---lulabapiwakikebami.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9752df98223fd9cd0c60d7f11f2341a2/52726483883.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vuwirubawibaro.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/89984336292.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/43800693072.pdfIn PDF document text
    • https://33mobility.net/uploads/files/welumomagodokuwuj.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e72370b39---22419115615.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/ropugonodufowafonola.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109121033169172.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/wupaw.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/nowugivuwa.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/pudoxa.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wazoladetafamofusibewav.pdfIn PDF document text
    • https://successalpha.team/upload/files/2794341296.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/ligapasij.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/21563181800.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/nazabevumosujepavonojov.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af98960bc9---99542616406.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/dokoxa.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/31080451226.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/nexuso.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jugezubetufip.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/viruvijusirimela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=a+word+that+starts+with+yPDF 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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 17832 bytes
SHA-256: d40218a8075be0321af91e801fa55f179b05195b77c07062773a0545a5b99e9e
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 10244 bytes
SHA-256: c3fd5f9164df037d4c1a100c98692dadf844a8c0d2ed6af07f8c99db47ca721b
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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