Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff7cfbb2b022fbb…

MALICIOUS

PDF

97.0 KB Created: 2021-08-24 03:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3daf7f795833e7e477efdc66a79bdd8d SHA-1: 7a49be5da54ee96d052b876eb6b5f32acfa17972 SHA-256: eff7cfbb2b022fbb57c634ef1817085f9372ace7addae74cb1d45ebae42295b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e8f606bc---wabijuluwowal.pdf In PDF document text
    • http://pokeocncafe.com/uploads/files/37601970521.pdfIn PDF document text
    • http://abpaluso.com/upload/file/44592614322.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/1324406915.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093abed52ddf---32879462339.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074907add088---8551933901.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fojapamomugatabaraj.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-23/20210723150719756764.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/37779695978.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bf99fb79f7b5c413eebbd4983424bf5a/44261335014.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879d49c433---mojolomuwafiviwogusiv.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/perazeje.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/roguvewikatisupeba.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775393d564c---nuxudujefavovajaro.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/26191635960.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/53b240383cd52f0efdba0c3ac46d6d16/safexixi.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/601f1675b2649d51f97b0cc038d04d3f/topuzesagafizojiduf.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/sawafefuwobatovipobow.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/pewosemaxolota.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/wasunevuredavipamij.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b851154e1f88b4f867f2a2bc92eee4df/96326354234.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/51795433514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=time+out+timePDF 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_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 17956 bytes
SHA-256: c9e6653763d6b517beb4ec9eeb91064784d81c656902c12ffb85faa285e237a2
font_02_sfnt_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 9752 bytes
SHA-256: 03606021951e8ec9afd9ee7f603a917ba2ba634736d3bd9d2a80b077783a2987

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