Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff6f9bfa976bab4…

MALICIOUS

PDF

79.0 KB Created: 2021-07-14 10:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64cfc7092b23cb2e14f7a2ce06ddcba6 SHA-1: 2bb18fa507d17e8aa4bdd3b8722b17bf5a229ba6 SHA-256: 9ff6f9bfa976bab4c59c65d686d1c686d2760ae42f634d111e468f2be827950a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various compromised websites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and the nature of the link farm suggest an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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 http://andrelandberg.com/userfiles/file/97248436575.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8b2a03331d173022ea28e8545bbd2cad/70653554591.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05b520b15e---63413129598.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afcfde9df37---mabarakave.pdf
    • https://mn-lawfirm.com/box/userfiles/file/nuwevekevuwajekerofer.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ta6up1s8a4pfheg8mc98j5dlig/radatijenikugokivakokan.pdf
    • https://angelsstaff.com/uploads/file/6774744464.pdf
    • https://peilimineko.com/userfiles/file/2338169132.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rjfeass9de85ejekddtqlduns4/muverasuxaz.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/fikitomabutukemo.pdf
    • https://infypos.com/infyposcms/media/92624662265.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/wavojusisefodaxijaj.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/mpj260spuh0rbkvnb3v6f3a3am/306133597.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/omskqd8atctdpp408nisoaq38h/norarokemomavirar.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/879odib4gdrpr37esenmi88ap4/boguvasopof.pdf
    • https://mtmnetwork.net/uploadEditor/files/92814066792.pdf
    • http://narcisse.sk/editor_uploads/files/21242917347.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ig3i9fnm6a8jt90t10j96p6th5/7587547085.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4f8700ba7aabc4d8ef89d0c1906bc8df/losososip.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be16fec5933---76023588384.pdf
    • http://studiovalentini.eu/userfiles/files/62514457176.pdf
    • http://eternoohydro.com/d/files/34817173634.pdf
    • http://beliangka.com/contents//files/77341425301.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/ladugomotibaviboxusofiz.pdf
    • https://skinrepublic.vn/webroot/img/files/88633491155.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=torrent+for+microsoft+office+2019
    • http://pro.ovh.net/~tribuene/images/banque/file/xizudozagezukuriruv.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_off0000d518.bin
e835893249a9aad38602fc5365928ffc6038e7d7d8087c3d946776d856b49820
pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 15912 bytes
font_01_sfnt_off0000fded.bin
0bf89f7c8d9c7542ce5b231af2d72e03224dfc8e38f5e25b3c91b0ba2c2090d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10712 bytes
font_02_sfnt_off0001169e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16792 bytes