Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c17dd748bf6a8d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 09:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18746c7a5e94994091d6e126a608e3d3 SHA-1: 69dc18def228fbc4482e5445594ba9b540a4a700 SHA-256: 86c17dd748bf6a8d1372389ddfc9cdbfad8dc86aeb4a2ef575320437d38d7ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://car-zone.sk/data/data/file/64172808233.pdf In PDF document text
    • https://youkuvpn.com/upload/files/20850593334.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/83266156519.pdfIn PDF document text
    • http://berbun.com/user_img/file/fegudikabigixironij.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746fd33ff8---10102626179.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/42507334619.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/pomamane.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12684151429.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/guzuzozovi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6915962111.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/mizevidotujevotunod.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/sofufekeneg.pdfIn PDF document text
    • https://onecre.com/images/content/files/70951729000.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/77510870019.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/ragipidenakokanozafuj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e19cd342---80297852341.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ptubv1b4pculid8gnaq8ijtul7/26121966256.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/75014984153.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/karokivevepaguzofowuwi.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vopalijonewubumugezag.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/36206806736.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/38868154894.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/23456440469.pdfIn PDF document text
    • http://houselandia.ru/files/90723221666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=aplicacion+para+editar+fotos+en+androidPDF 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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 19332 bytes
SHA-256: 5b296fe6499957b5b51b4cf493bfd6a379ad60c4613efd3fc57dcf993a302480
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 10596 bytes
SHA-256: b75ce7b2d546e1373d3319ca32c4b3787b54768be04eb5df1d595cde8be16e45

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