Malicious PDF — malware analysis report

Static analysis result for SHA-256 340872fa96239961…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 04:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6f549aba1b93643931b6289819ece18 SHA-1: e40a5ed1c7f974c1c3f2737739ec0581f2c77a4f SHA-256: 340872fa96239961a653d3c37fa470bf5d9fa43111f7a00504be368a2c4cce4c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://soles2walk.cz/data/file/82193080943.pdf In PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/dupotusanurarojegola.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/zefugedaruxev.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1c2f5494a---50498767287.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/86948488530.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4ef75eca63bf950d4bdab68d641eae99/jasoxoresaripizopoxubefot.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/zugefixunamuvamavog.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/80038002039.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111cc91534d7---64033085037.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23c4a2c1a---77772737522.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f0839d8dac63ac66a69a395c5877482a/vaduzovagemebizit.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/memijasunuwuzaxe.pdfIn PDF document text
    • http://garderoba.sk/images/_file/73570659934.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/fopazuda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d031187c5a---77336456293.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/99308324483.pdfIn PDF document text
    • https://fasleh.net/Files/files/jujexomovakefisepakos.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da4396d7294---90078180443.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8a1e7e3d---20452408540.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/boxizut.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/86340024787.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2dfdbeba1487e894948031ea9e443ef9/zujavupomozivavafanujuvem.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/temawedosizododoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hrm+quiz+with+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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16480 bytes
SHA-256: d419b8877c5011a40ee34b29d9d5f6a385cf43259a1440d43c2635ed51aadd15
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 10592 bytes
SHA-256: 99fbd615f7a5df669f056d1f43e4083254b1f64eb456b1171111270a2b7c942a
font_02_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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