Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14bb8840240a7c1…

MALICIOUS

PDF

183.6 KB Created: 2021-06-25 13:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bebd246b11bf7c5e9a2be1657dd7343 SHA-1: 921a71369f1d91960d5c688f4d2612259f10ea93 SHA-256: a14bb8840240a7c17383fed376209c3c6247fc78963ba2ff8e95a3c062f5e064
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS upload storage. The presence of these links suggests an intent to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://textolinguisticsolutions.com/upload/editor/file/zuxekukutuzi.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b331136647---javoragekuza.pdf
    • http://toshiteriyakiburien.com/uploads/files/rolavurifotodixozetobirev.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/2463598818.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3a341dbcce0a389a2fc424fdc8672716/46295609697.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b2bc3763---95412924756.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d09365f3bcf1fe66c7d392a80862218a/latitowowuwetobakogufox.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/638ac2b801e2fbf6b68c7b2742686d20/62380113512.pdf
    • http://whkmradio.com/userfiles/file/torudozakapifelireko.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/kuribagiwamedefogojed.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210525234920.pdf
    • http://fonnepal.org/userfiles/file/sutipigurufikemumogeriz.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e3503ea5---vepupojumomixofepase.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7319c6f9---42575145788.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/da81556b4741514786035f5729280277/xarorubawonajojisokekaxi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=anderson+elementary+school+supply+list
    • 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_off00027223.bin
a07ec18293476c3b6da7a6631fa472e73450bc72e3ce2546f11a7137066a6204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27223 17512 bytes
font_01_sfnt_off00029f9f.bin
0807437d3fc61701a7b96cc9bcb9f6186a742106b4e235095d8e280f5390ec9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29F9F 10972 bytes
font_02_sfnt_off0002b8f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B8F5 16792 bytes

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