Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e4b3c8888eb82c…

MALICIOUS

PDF

109.3 KB Created: 2021-06-28 12:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40191a3000fcd78acebe103568661bf1 SHA-1: caf7a6d784ab3566c7b1bee20a7b735dfa82ba64 SHA-256: 10e4b3c8888eb82c92b03b6d6edd4183270b7c13ac05119116812882b04f725d
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, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://unosms.us/userfiles/file/7341255708.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/jjk27m0bjatdg6kfcfreoe6rpu/27560433523.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c4a953c3---4596151096.pdf
    • http://fotocaroli.it/userfiles/files/75936959036.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de928ef819---20598281304.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/1d6d8ff8aa2a6020e5920b0056475294/pesasisileralorotawodave.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ur2j02hpvgvf2uo515ih8q14vb/zulepisutegafadat.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zuferu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a010dc832b1---67660309787.pdf
    • http://zrdb-drogbud.pl/Upload/file/risifizibezomuxikowo.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3ko8qmv0duu3rp1pg922gpbgq8/noruvuvigejovonopilut.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d08e700e7---xadixuxoworekatiki.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c39bab2ee---73080997063.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/8559568568.pdf
    • https://aydin-elektrik.com/resimler/files/18322372194.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/20da51608c0d16e62f087b8e0657f423/sapexunerimekezikenumag.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/dazadotubavuzatujewevo.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0518f39b---25791694839.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132f520510---wotaluzazijozinunenagu.pdf
    • http://naturallabs.de/userfiles/file/59918821510.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4grrkrnagunllvh5pqn818leh/96627437622.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79ea2dd90---zizazogabadijenafotonunow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=methods+of+persuasion+psychology
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014709.bin
62884545e15da2ca3cf04b0fec1dbf220599291c34d7916b99f02a1802ecfbec
pdf-font-stream PDF embedded font (sfnt) at offset 0x14709 17940 bytes
font_01_sfnt_off00017662.bin
a132d7f04837265e7a678a67840ddc3ec005cf789e02b087cc1a57682e173ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17662 11108 bytes
font_02_sfnt_off0001901b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1901B 16792 bytes