Malicious PDF — malware analysis report

Static analysis result for SHA-256 5953177c9c0a38d7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 16:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f12e57b9261c0c28ba629001c2ff256 SHA-1: a43315ba9d03b341a1041fe0aa71e63f9128dbf2 SHA-256: 5953177c9c0a38d72cf62fce22a207bc81be740bb53ce5372d670ca461b2acbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.nomorcantikspesial.com/file/wosuvagar.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/23485673ba82bf3bd305970cf195c0ff/56819730640.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/bujitelabidirewixava.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210723195558.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/diduperux.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16112d59127df8---gerobafomaladitasakadano.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/roxupiruwixozofe.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/43904356859.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160870d8ae515e---nidazuwaxoteniwilejej.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/sivubidomoxijoda.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/notksrpa1auhgp2u4afh8ad7rj/kulorokojexawurupego.pdfIn PDF document text
    • http://signauction.net/userfiles/file/xaxodemupukemabi.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/20993798739.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/tugozab.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c954d7ed234---totanifodomorerasobunoza.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff2606fcc---mutamuwatadofulonipepigog.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/jafofaxovutonalawogevivi.pdfIn PDF document text
    • http://sivam.pl/files/file/45268076155.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f9310cd914c709287188e7505ad5b93e/94538313067.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/zosanovugugovilomuka.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094379303754---tepurabegep.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xixetejununikeburumesa.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/25406895962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=teaching+language+and+literacy+5th+edition+pdfPDF link annotation
    • 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 18108 bytes
SHA-256: 32b5f4a32f8fab5815616dc022d73b9d4ab5b77e5d0fe804b692d19b7b4e34c6
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 11044 bytes
SHA-256: 4f3abebca6444f22191ea0e9ff6dff550512a30773e8722dba87cf4c297ef704

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