Malicious PDF — malware analysis report

Static analysis result for SHA-256 83987e49c36a757c…

MALICIOUS

PDF

98.8 KB Created: 2021-07-15 19:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 605da511c58db0b8c45f7344b0c75db7 SHA-1: 87c0dc47ed53b7a9c70f79d9a808f8c43f5d8a7b SHA-256: 83987e49c36a757c31b2a2f81f8c5070887f689fc678ab729ead88ad1dcb306a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://jbdclothiers.net/emailer/userfiles/file/68536465261.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4a3f2cbb---55664095728.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/78272309508.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a46dcb5bf---9050870841.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/99522168818.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/13242f241eb3099fc010e0f33e4d94c7/katawaxoralivamokataribuz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a296e9aeec1---89110352806.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/suwor.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/ruzamezeduz.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2fqc3hcod5lfps12b7rtm2vuc4/zinarivode.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/71327301315.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/62074952020.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/3185332511.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9022500e---33093269879.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/84sr46ad5huf1r8gsq5omt9jtg/nalumisiduxisepuzet.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/12670065633.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/pudogubid.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/47ebe3b4211066613ac5bb040c39a005/7693134507.pdfIn PDF document text
    • http://ewtch.com/upload/files/bobakipuxijoja.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/sudasuvixazep.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dd7b8s8uibhmqm57n66uvb5hib/1483331614.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ae13237a---21095977307.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/38n29t0ho73q7s65o6gdnoj0je/73127658540.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jfejluphle95lupv0gj7ima1lj/xipom.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kdo0i77qbr4cddev6n42nrkqvs/70033256718.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9dfeeb1c3bb3320eaf6488a5efc18c50/fokezimemutewenivurisol.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f2c80cf8---55284713392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anchorman+the+legend+of+ron+burgundy+streamingPDF 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_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 17544 bytes
SHA-256: e3a0c020058816843c9b5e216988460a3f453332e6294c491adbb7eb3cc6f146
font_01_sfnt_off00014b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B42 11256 bytes
SHA-256: 0bf70c81085ccc1b79389c937f6353fbb663e62001f02013fc0fe24725b15ac8
font_02_sfnt_off00016550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1