Malicious PDF — malware analysis report

Static analysis result for SHA-256 1857aa42e43a5e66…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 21:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9525ecc657ec6549981edc1de057cc90 SHA-1: 0dd0c0dba877041d74a52444d67f5e7a1fcbd7ef SHA-256: 1857aa42e43a5e6641d5126ee96e97c1c71808e1198fad3f8f4c7c70e493b0f2
176 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The document impersonates a cloud service, a common lure for phishing or malware delivery. Multiple heuristics point to the document being a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and embedded links are indicative of an exploit or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e461b0a756---zadakidutagerenaj.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/318132d2edeb71eb0fe8d2328a0ab267/pudukuzumoz.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/572e737748f5144562eac7b09fb4cb88/repetunosetosarurorulol.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/40fpet1v7n78v1rb83n8isjfjmj850up/xasugofuriwivikurowu.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6c494549e90500dd809882cf6649fd44/46557585796.pdf
    • https://keluargamimpi2.com/contents//files/muvevivubizoxe.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfedd6c10---17466442693.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744936cc128---buralezibas.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/2637989977.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/05kc0vml60h4514krs7cfj6q7t/zanazaburonuvukuxijoj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74462ab828---67555626957.pdf
    • http://adamlegal.com/userfiles/file/waveserubojadima.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/63q6nd2vsp2c66j28bsq0u5khu/nodexamigawizavin.pdf
    • https://tortugafilms.ca/adminfiles/file/77040529814.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d078585f---gunodomavu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160816d1aebe1c---61099892119.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e7530478f1eba60b16042e224a481d2c/judag.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b19a2d7a8eed2a3a827f0b32452f273c/75756596333.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3fca211a---gonenilivuluwutesudune.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4e264fb2---48704998043.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/734b45a05e040b6662e36c440dff8466/96360908323.pdf
    • http://bomtvplus.com/data/board/file/20210524155106.pdf
    • http://kashima.cc/userfiles/file/43613476012.pdf
    • http://broorybulldogs.com/clients/33993/File/43555256627.pdf
    • http://campcolefamilyreunion.com/clients/82065/File/68487301103.pdf
    • https://dovolena-jiznicechy.cz/uploads/29485114603.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=using+technology+in+the+classroom+benefits
    • 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_off0000ecae.bin
e29b115473d8d152d217c745cd9b4a4c2689b3308b9ba659d1e1c33bf3ef6424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 17376 bytes
font_01_sfnt_off000119da.bin
22a7c515b68dec99faa3143f8dc9ea98b8b5cd15d39bdaa9c22dc7b37b50e949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 11044 bytes
font_02_sfnt_off00013364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 16792 bytes

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