Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec49d3e321c48ec…

MALICIOUS

PDF

108.9 KB Created: 2021-09-05 16:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f81d556967416839e353007f75d1051f SHA-1: cb59f1099c3652ed06f808df7cdcdb9bbe431502 SHA-256: 3ec49d3e321c48ec893a012848980e5dfdb926826180be3edacd86b8fffe428d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is unreadable, but the presence of numerous links to potentially compromised sites suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0da3f260---18252659981.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f500a22e70a---zovikatol.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/perolug.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/13889364779.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lsvd1l0vbc9onq78iq6h303hf0/39864219741.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22322171717.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3f5ec5e0---jakixazunenedotedarave.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/q9gamk7ptes5ss6j9u38i79hus/lutesurudebukegewabunop.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/98005595588.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca68ea555e---1007055449.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210811_170212.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae21b537c---miradelujokafawarorigi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/489678525.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3ba85aa7---kuxinekonopokilol.pdfIn PDF document text
    • https://negaratoto.com/contents/files/nazufikejukugadasud.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c2ad5aa---84949354983.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076267e9cea8---seximanasowibuboje.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/gefatolaxusopiwati.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kufedodalapobowese.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kunovut.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9d8a29ea---82281185886.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7676d7120bfd2cf281bc904bca9e8f3c/47908954300.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/nidisepedowape.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48ec692efe897f45ba0275e56aa65c84/rapigetagebaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=noirot+heater+dm7358+8+t+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017644.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17644 16604 bytes
SHA-256: 325983a6fbf4e0365a7f81a63c178c9aa357e6bebb5f2534c379ece181a50c06
font_00_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 22412 bytes
SHA-256: d3d0b1514dbc3fa6145a6931bcedc9b5fb4cd20c9432160e7228dba6fdca53b2
font_01_sfnt_off00015ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 10984 bytes
SHA-256: 533e4be493ec8173bb4321284f1bcde2fd96885164edc3a040edb618ae904e3a
font_03_sfnt_off00018d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.