Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96b2f7404ca5785…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 05:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 344dfb289eba897b0ab8de15cb3f44f1 SHA-1: 1afef030f9927fba8fe037f92bc6a2ae0685cabc SHA-256: a96b2f7404ca578548315ce6f23637ee358aef7f2da57067cec1a4824132fdf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites, under the guise of offering a PDF editor. The primary attack pattern involves luring users to download malicious content disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://seoulsquare.com/userfiles/file/85327647065.pdf In PDF document text
    • http://splogservice.ru/content/file/nizukejewum.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f96a579b8d63962521dd3e09c1ed606e/nabavumob.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/77940643e4eb35e3187818e471bc558d/38396010653.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/lupiwilixiw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/849c0efa519c4277a95f4c5c13a11ecb/1155851162.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/rumenavojubeji.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/datoju.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/730ae9f9a42b23a3323374443a004ea6/vefusideguzotumopax.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/jilejim.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/kebivej.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/babuweduzepupajuku.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xexurugomevasixi.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/dutejuxodijinazowerido.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/83372103100.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b42aa3dc5c3d6c5d11eb5f6aac50b293/62789067084.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/pasepepozowowoki.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/72339578037.pdfIn PDF document text
    • https://buyafranchise.org/files/files/dumukepewabadokizime.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/mavewigotazuvovomemo.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/niwovetuwur.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/84378343902.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f6fd1a9c---23159975426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+editor+free+download+for+windows+10+64+bitPDF 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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16612 bytes
SHA-256: 63938c39d224d50a4b5a15867e974eb9706cedd64c1316239a0bc6a143e81028
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10996 bytes
SHA-256: dbf2d20ef9149f9523743de5f4c45c8230dd5c0f832f37ff20a7e954fe187124

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