Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bede74d0278bd9d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 08:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f292ff75c7b6090bcc0c63b991899340 SHA-1: 7d8d11425daef303adf05a4bbe6a59092e46f9d7 SHA-256: 1bede74d0278bd9da1520147894ebb0c47cd686f8fa0554b430319bc3135a5a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=which+apps+are+running+on+my+phone PDF link annotation
    • http://myhomeinparis.com/userfiles/files/xuxat.pdfIn PDF document text
    • https://ags-car.com/upload/files/16480505016.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/41901928257.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/daxufejamovodixumiminus.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/54220521505.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/35758991477.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a6727ba9ddca00902c4d809f83bf6466/11404621092.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/lujafusaleniwij.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/vovodifumedije.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412421e207b---nurodedonisugewowugonavi.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bcd153dcf2357af8a8d1bf6924454de/tinetakutosinapopo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sinajojunoxitil.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166e107c07---85552682708.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/3150635983.pdfIn PDF document text
    • http://portableandcool.com/files/files/buvafa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bebc57cd---lewitedudibufakinowaku.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/muvasoxufiwubekululepefum.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/rasedobukemow.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161335425cd36a---60818246734.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/83620431000.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/tarilosolenizopoxitoralu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161382a144cb8f---20890942320.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10884 bytes
SHA-256: 5b48c275950227b93f061fc870df4b28aece5955d7dc75bff643e0900cbccd46
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 18148 bytes
SHA-256: 425780fe938e79b297fafc2535b26b899e28979857e06a234fdf323f3bb38ce6

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