Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b531c2015806c51…

MALICIOUS

PDF

201.3 KB Created: 2021-06-30 04:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 487f744112f659fabba8b4256c1876cf SHA-1: 922f2ef0fc9eef94a6487d62d08b76ae291d03aa SHA-256: 2b531c2015806c51950fbede1689ff96f9a32427a25b2e7d305c7aa6636d1fd8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-severity finding for an SEO redirector link disguised as a free download. The ML classifier and ClamAV also identified it as a phishing trojan. The document likely aims to trick users into clicking a link that leads to a compromised website, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6b896bd5552763c6bb1ebb0222ec658d/ludizono.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce79505f4a---sopajozasaserezawiz.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/u77mj8n2t89o03r5ecfs48nql4/jasatizijezobem.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9e708bbca8c46885a82488d6462a0d69/16375534527.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e457550c---53295776907.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/vesusodulerijitegonixo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/33568249645.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bff81cbfb37---jesupo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa94f31d---minutokot.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fimibe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc483f04e2---nitofodejagiwudokosik.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/luzikuk.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zukunitufuw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2f7679631ad52389708257a79ae87c60/1646251481.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/bovoki.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7144775eebc820a1caeb91a838bf35ca/95419935698.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/zoxepufikeka.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/61644832416.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622977868.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3864d337---losutopisu.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/xirosupulafonidusu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f15317adaa---patazisagoloxakuzunemusif.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/30790034167.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/zotoranamu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/15760380957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mary+had+a+little+lamb+music+sheetPDF 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_off0002b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B4CC 18144 bytes
SHA-256: 635b75be4ac138182515452f53f9c540be5de9e80b1eca124afa39cac245072c
font_01_sfnt_off0002e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E48D 10756 bytes
SHA-256: 1c8d34ed399dae961f1b0aa1e843b38832e3c975d2ae3ad9d707697b91ac7406
font_02_sfnt_off0002fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1