Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c7b83014df6453…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 19:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1994d5f79eb77333fee51e8a4b2dadde SHA-1: 1566e5822d20877fae183f14a42d3df5228e4207 SHA-256: 78c7b83014df6453b1f4b5ba56e17012c04e43de27ae5057cdabc21bbee16377
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://robertfeinberglaw.com/images/edit_images/file/nurusaguraresab.pdf In PDF document text
    • http://pusancard.com/userData/board/file/51234232033.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b32a01048---busomilajijetewupizepame.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3bf63700---95647414105.pdfIn PDF document text
    • http://usagimatur.com/files/others/35759646488.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ae3dd7fc98435144db19958f1204beb3/9623409762.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/t592v782r75dh2qppv90oq6cj3/tupomakusepofevotale.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf79d122b9e---suwopurupigelo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hvr4octlq0rn94s6v31vbh1kj0/suvamumezirozorurukep.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/97785016819.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/75479985680.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/godidigiwurap.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/manonaronebunabutu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddd1b8f3cd---92330557190.pdfIn PDF document text
    • http://vitrine-prof.com/files/linifajawamav.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/dexizij.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a431464e91d---nufokilajejadenoba.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b2e55704dbc4fbd0c4667a9dbe53dac3/gatonu.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/30605332330.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738f1850f1---3010479841.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ad1709e8c72212f17c4762d1cbfa76ba/xejixatekita.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/17418562737.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e1eea537bee4fd706d55e042bf0d40ad/kagugasu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608912bddb80c---kutegelul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=performance+review+examples+pdfPDF link annotation
    • https://lapdonline.org/file/72875832407.pdfIn PDF document text
    • 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_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 18800 bytes
SHA-256: 4d1f376b37c6cd82e13a98a5b905869c2e22621003071649b0636481d39bd975
font_01_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 10936 bytes
SHA-256: d2649f73b4fe6bf3b56586314dac43094192996a2af5ad1fb7c089944a1da765
font_02_sfnt_off00013676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1