Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d88fd48cf64d96…

MALICIOUS

PDF

73.7 KB Created: 2021-05-11 20:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebc6fdc55e82d8a13ad57bc3968b1806 SHA-1: a940d6525655ab7aa73e569b9711897afc27e95e SHA-256: 78d88fd48cf64d969a0229b269f625c7034a07dc54a9f528228839db23f65102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links to compromised WordPress sites, indicating a link farm or distribution mechanism. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60fe07f19---47792110990.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/78a7415fab8466ed75cd33b63534c842/miseju.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082f044b609a---rulavelalejojonu.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f937d16a22---42752477227.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbbd93f7a---mejusinago.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65965daa2---81985390157.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3b657ac3af0de749e21bbc7cc6e7c2e3/45605952547.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mnleqff5cuk4lajhlccng963s9/nunen.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160877b52c471d---34521589118.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11774bc6e---70879356874.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/12k3f44t74ma45vaeem73demd7/56715322915.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3649eb2862124d995a04018d64b65666/mirudoxuxezatu.pdf
    • http://lycee-elm.org/userfiles/file/xakelewazavekokegiki.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76bf7d191---sawenagetafoserizitajazug.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099117e7ebbc---nedadofomubejemunetet.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd9718a29---99187440002.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1ec659acac290e0c2baf079d9c413c6/85320173677.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bimx+archicad+19
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0df.bin
db01d1b94b1dc06b1d30e1e929ee209dd31081d52751e81d92bf925ad4ebdbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5292 bytes
font_01_sfnt_off0000f2bb.bin
8faa444e2bea975125706b8560451c5aa6ca9e2fdc2e3dfa3f612a4a52460f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 11144 bytes

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