Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac990785bc8a577…

MALICIOUS

PDF

88.9 KB Created: 2021-08-11 00:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b2a37c42c3909ee3eefc08977080321 SHA-1: 8af458eaf7b5dd90817b00ed759d49ce874137b6 SHA-256: 6ac990785bc8a5770b68d2c82a5681ee5ec91ebd18d2e8575126c22da539ce77
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to facilitate the download of a second-stage payload. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://crewmak.ru/uplcv?utm_term=codigos+de+canciones+de+bts+para+roblox
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jfk8milaok6hmqtm925doalad4/litedenugurujizopevazidoj.pdf
    • http://tunglamgarden.com/images/fck/file/dotanodakoredarawiwof.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0881c6eb88---bagizudunajekukerolez.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasux.pdf
    • https://scavilecis.it/userfiles/file/kimaretakiwakegeliwisew.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c174e878ae6---poxefedevuma.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b593ac3d5a---67416834147.pdf
    • https://sgotomotiv.org/upload/files/luparusonowikukuwokalet.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16102d444a8328---dubavasujupawoweboreg.pdf
    • http://sherylrobphotos.com/clients/56056/File/sawokenarigolibigowuwixo.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/piig9tfblpj1cpda8tu1neg6a1/39425444747.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/titijudin.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/pebopapunibimago.pdf
    • http://nenkin-t.com/upload_img/ck/files/5491598028.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2345061bc6a81cf69301140fcb4952a8/jelivo.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jb0minvtkmgtaqq7u1cjpag394/25959610347.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5n9of3mj8igai6ll414f53eik5/88751304774.pdf
    • http://bukharageorgia.com/sites/default/files/file/fisuwalokexazisubafova.pdf
    • https://sharadsangam.org/UserFilesTwo/file/96289440132.pdf
    • https://detectiveoffice.net/userfiles/file/91314042985.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/54393a01efdbd2788fbab139f3cd93e0/88152000992.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16792 bytes
font_01_sfnt_off000109ec.bin
cfc50ecc44de0d67f7667649cd09db0400df0b9f1155739a85d955f1f5b4133d
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 10964 bytes
font_02_sfnt_off0001230b.bin
783d061d421f975509430233578a3138a0f227376957fe379159a65e24af0d16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 18712 bytes