Malicious PDF — malware analysis report

Static analysis result for SHA-256 99faeec72a693f3a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 05:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f7a14f4ec375748919aedb7ee49ef04 SHA-1: 86388c574c2fb2c8c6d22baa8cdf634ecf2492c2 SHA-256: 99faeec72a693f3abc327e7a64d129117f72a9f9fef63ac19e6437249252428b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports this, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://accapierre.it/userfiles/files/16533452408.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad264b4bed---35498702421.pdfIn PDF document text
    • http://sooclose.eu/upload/File/xebefusafe.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/12697409139.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b95d71ddca---87746383055.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3897342d5b82b7e42256411d99030f45/zumavefubibugelu.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/bivijoto.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/89852203b8e2d6af214d2ea0d7e6c211/wipegemamozez.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/sejopegasilipewekoji.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66eaad7a7f---gojirepegotajagu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/13348902945.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/89740543717.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/978kued4p5bn25b1n45uh8rlv1/27744279894.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/napajojibumigevu.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/74479534128.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/pafijulima.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/7251161193.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86693635739.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/viwojujovul.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/vonufediz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc09c55976f---30413412511.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/68211927394.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/498cc721becaaf7d421064ee58a0f0f9/jozasujidakesejuzuwefe.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052222322510410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=30+60+90+triangle+worksheet+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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 18488 bytes
SHA-256: de4b3ecc32139414c44f04bbbc5fd5875c8a43f96674ae174aeec93ca85132e2
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 11096 bytes
SHA-256: b24d5f20d67967c4c9909cab8a7c2f63593098a2b1ba4b893e70cc4fd9bd09f9
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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