Malicious PDF — malware analysis report

Static analysis result for SHA-256 1029195490d90ad3…

MALICIOUS

PDF

88.2 KB Created: 2021-08-11 00:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84d11df7e1154b3aec7c8c9974f1a264 SHA-1: c3934ff854c013d3bc5cd73b8829cafea4c8ef2c SHA-256: 1029195490d90ad354ed05f7ebc0d481a8d0efca91b96d7d76797a55dc9ab76c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm used for phishing or distributing further malware. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hainfelderteich.at/dilugisekelutavib.pdf In PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nopobejapajanexevovibur.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/govugezewenemetijagotamug.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8b3038e916aa55cd1bfcf7106ee98006/97880074290.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210709_D0D8F4842B1A4B03.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210618091119.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe55bc8d05---55562690169.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d660a7514c5---99204259293.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/71025388367.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5320fc2fe9---68802993222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e74cf656---31271294389.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/sawagepug.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/kimirusikaromukabipavud.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/65989711224.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/48378834538.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/bukupirasuxezikuw.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/nejuxuruf.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ff282741cf38b75045d2b2bc51920b38/litudolasamu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fetaxekefe.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/68603597232.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/90024702798.pdfIn PDF document text
    • http://boldogelet.hu/media/16437885172.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3uqo4l62i1mtnhj6lgfdh9keps/gedinekititajadebewudowuf.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/15461190927.pdfIn PDF document text
    • https://chpcentre.com/files/file/9554995029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=functional+group+worksheet+%231+answersPDF 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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 10908 bytes
SHA-256: 280ecc0bd8112d81d219a6833538bdbcd81672b8b66bb0704c78c85161769de0
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 17100 bytes
SHA-256: a0a5832042da70173caa3116601bed418bdb7a530e598011f741fcdddae023aa

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