Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3f097a592ecf59…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 08:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40d52efd71936516d68c3f91e857e97c SHA-1: 03f18a09040376284fc07c03b990e91b13b83f85 SHA-256: ff3f097a592ecf590f553f43ca6b6c6b1aae8fd8943296caf68994c90aaf3fe4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=bosch+ve+injection+pump+service+manual PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s44b9c3fued9233oguotdct100/mirewomiroronojowabivebi.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/07ad7d4626eea4c299e0ca7832dbdc22/ruvewepixipizuganob.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6oj52q4mpcra7o3vaq8t7h856g/94624648743.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40c5b6477---94399462905.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/texeb.pdfIn PDF document text
    • http://vodnik48.ru/content/file/36830323449.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/zabavakukosud.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/3f8e6071e18ac3403d73d60357ec6d07/tizowilemozo.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/tikekinekakugurez.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/50576514770.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/27637694129.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a864e72515e---kujuvedafunerapixarujipi.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///vaxebulinovir.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/birofusenadipifi.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/20714443183.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/63862133477.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/gifupuwisorulotak.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kugakegi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7b9605d---55560184899.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/sipinusepusifevowami.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912ea8dca52---vaxopexeropubobolopobiv.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/59332832979.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748046e174d---61101569673.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xokosof.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/10015423115.pdfIn PDF document text
    • 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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 10988 bytes
SHA-256: 0d6bd666aa61356203af1cffb097f3541ca4505dc5753fe9ffbd4b8516982bce
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 18268 bytes
SHA-256: 9bfbfee7d5a6dff536abf7fa4307651edc5cb554f56ca077302a76b5a161a11e