Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a3b672f37b3079…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 14:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bed4b809f85ad4d0e4c7976bca1a44f SHA-1: ec22c6128cec9811b0fdef8cd58ecc2be437f0ab SHA-256: f7a3b672f37b3079e279a6a6b9253f3f26447c2748bda144dabb037e60f03548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=download+new+os+for+android PDF link annotation
    • http://jingyilin.org/uploads/file/moxifokinar.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/82400806541.pdfIn PDF document text
    • https://pepsima.biz/files/file/65504119998.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090209595169.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/jukigevi.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/warogen.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133989101aba---45649266041.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914090854330919.pdfIn PDF document text
    • http://infosierra.es/images/editor/jewadavaduzokufosavigoru.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/57878563402.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/66072045900.pdfIn PDF document text
    • https://conrays.ru/f/data/81909490968.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/65231871591.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9058c4f15---38639281939.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/viwakerobuzin.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/bivetofaz.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/53291183907.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/retuwudajekuvikebux.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/68861299264.pdfIn PDF document text
    • https://signika.pl/Upload/file/84121110763.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa12c6a132---52768687689.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sadajezoteretexuwi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17091ba97---34568243520.pdfIn PDF document text
    • http://bushurov.ru/images/files/mipufomeve.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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 10336 bytes
SHA-256: 109eee9f35ad90814e6f05cde880f3e854af5fade7c43bce5edd3f5e19226c5a
font_01_sfnt_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 16972 bytes
SHA-256: 697c8230ece1cfead85da6207d0eed586ed1533fe8b328cfaae29a9436dd4281
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1