Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a575d5da5e6fa54…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 06:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 806ed93c6ce9d3077b35c8a5706c87df SHA-1: 8fc22829bbad72a2995767a9f9856877146287eb SHA-256: 7a575d5da5e6fa54d9dab9410e7bb9527446b7510fd756f3ea651349081a2cb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm hosted on multiple domains, some of which appear to be compromised WordPress sites, directing users to download PDF files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://anmoul.com/userfiles/file/22645316818.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/47462629021.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15697ac97b---bozenukumirobonaz.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/bipurudowukejotenewojutu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/waxapujujixurariretetadog.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75fb77b39---54688418080.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161260c6001bab---wazanavabebezusowof.pdfIn PDF document text
    • http://kodemari.info/data/files/wepaxaledokukadolulivu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f2bb707aeede070d8b13e309451abdb/vekukepevujiradaneja.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/33203170868.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f3bc332b---jusedatonuwumexuwoj.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e358c5a69---6916985396.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/jutirigikamidakozigakefem.pdfIn PDF document text
    • http://dangeloremodeling.com/nbloom/fckuploads/file/nunonemonazesagirefikav.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a431ad45947daf9ee4804a32ad446e2d/nataxepasuvilete.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8bd6cc2f3d5ee684cbc72d25f04286b3/67398604901.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/towufemesexabeto.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6714d6bf37cbbf36040eeb2134046df8/41845078418.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/xedowaladogenukodigitu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5865b1184---8933215614.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/diwutawimufuta.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/radubejuk.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60a46259e---fisexe.pdfIn PDF document text
    • https://senfina.top/uploads/files/xuzetade.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d69f16766b4---26586469294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=install+ios+13+on+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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 19028 bytes
SHA-256: d4e3e33311ab96e7e8f15518da87a5c3e06c83089220bcde00008a4ace20ecd2
font_01_sfnt_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 10284 bytes
SHA-256: 2d41e07bdde2eb48256fbb4ba6a827ea0228ccd0565cfe9bec30d5a2b12b706e