Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf54b4738c70c6f…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 04:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c376f8be3ad3f7bf14cd28cc67cbc8a1 SHA-1: 0f99c899db49034326d7c25b753b32ec2ddd637d SHA-256: dbf54b4738c70c6fefec1f527b56cf2ec85b0d08592e4b324473566869490d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://cructi.ru/uplcv?utm_term=esquadr%C3%A3o+suicida+download+dublado+mp4 PDF link annotation
    • http://aldara-latinoamerica.com/userfiles/file/32758491595.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/neo9269qqssce34eq4nudcb8pl/51952560356.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d29d521f988b90e25aee45613d515ff5/semudarefubike.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/fimigirokekimonufoniw.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/65731217248.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c975ab227---lexisuzebomelorasekago.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/28673436069.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9f8bd365fac86fd8c99836c4f8462c39/lotadosaregiseverogif.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/15656121246.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/rudevovedig.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/88795209837.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/6445640498.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/64ff187c54ae13d67f69f9912ad14056/90521372698.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/wigufululanok.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/61199080229.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/39471646503.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9v81iva1ora1jvt5ti2il9k2i1/bibejiwonanobagosanebez.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609863812e11a---bolojalole.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2b2fd54aadb39649bdf40c154317c4f/jamukofifevenopapafa.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/fonofikumoseteb.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/pv6tiqkqukvav24dvjqidenu1g/33988879818.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/83009293546.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/werukijam.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/85535071817.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/66116399541.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 20164 bytes
SHA-256: 0f5ba9b2ee92cdd1a084644723f4937c85a833df6260b5f3d9e38293fb657616
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 11244 bytes
SHA-256: 69b1a8a5b1082eb9b3c9260023e99bce58c212e421d3ee31044a3f1aabb5137d