Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a202fa83febe9b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 01:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a958197c6a40a796ce885b061d4e43d SHA-1: 99910bc64d1841a909a8578f46fcb436e648a5a7 SHA-256: a2a202fa83febe9b6e6ca761bb4345f2521ae0781a4a734848cadfa6ad14506b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution lure. No scripts were extracted, so the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://am-system.eu/ckfinder/userfiles/files/gavokofuzu.pdf In PDF document text
    • https://shop-ecobati.com/medias/upload/files/2487216520.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/45011803421.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358427c32db---98396788413.pdfIn PDF document text
    • http://slsnn.ru/content/files/juxowetiw.pdfIn PDF document text
    • http://cbstav.cz/file/mokugi.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/rikezijajazuz.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/xaxuwivitamekeru.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/tinuzubunuledapaduxugabe.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/vadilelas.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/82862217051.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e6125fea5---97236761238.pdfIn PDF document text
    • http://www.77ice.com/upload/files/59439372908.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xaledoxijivolilemuzus.pdfIn PDF document text
    • http://hocomesun.com/upload/63926678272.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/34942735388.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/22055479805.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/muxisajup.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/58291414997.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/31444352159.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/sopuvadabojisazirisile.pdfIn PDF document text
    • https://robertbah.si/files/file/64520517372.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/84002696859.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f1c2b6d2---79648042361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=persona+golden+4+walkthroughPDF 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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16864 bytes
SHA-256: 1fafd5ebaf1a0b4371ceebf6df35db8fc0a80889dc3d7249045e7728ae2debdc
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 10792 bytes
SHA-256: b7969df45e9760bd7f8b47acfa2da964c5026f86961fe6d3c67ba523c8c0ca71

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