Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af4e90e2aaa8761…

MALICIOUS

PDF

80.6 KB Created: 2021-08-24 15:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ece256bfef0b3a92c6a2f2c0c1956081 SHA-1: 40f7cf3b5c8021f0bece1e429ec73dbb0b30a6a7 SHA-256: 4af4e90e2aaa87613ef32f3b483b88189f49f74f27638db9e820249e05836ae4
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The 'SE_INVOICE_LURE' heuristic suggests a pretext of payment or invoice, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ef9b8e9---tijizabujumetone.pdf In PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/dilidijusuxezuvopaveb.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/tenizufatif.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/xabagogipuzagez.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/68121122572.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf24967ad---85862632974.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/76550773001.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dlmk3ojlregs9467mbqqknb2m3/32196562244.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f94b924f7a---sisimojarubajasavemudo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ledepew.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bdf5091d---nuluvutud.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/10f446bcf91eadc907fd9f2997df5bb3/70690205410.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/578b82be9c93b61fe925a3484576c118/xozodopadadejusivekupawuk.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/53968456341.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/77653077958.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/ledibojopenodo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160721a21925d3---jesiz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610548733fd51---29062001937.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610beaab4ea19---24026018706.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb39f0b60dc---36719581401.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/71797921357.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/fuvepizor.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/31340331027.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8ae0eb7f03ae00a146b148c8c6cde0b7/dikoxogatekotomu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac704967ba9---54374786935.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608059ea18c0d---10439817218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sample+letter+requesting+for+petty+cash+amountPDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 11360 bytes
SHA-256: 6937326b8a91989222f1b63a3f3add268306f31cc86314fda4b88d8349e865d2
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 16288 bytes
SHA-256: 1c5e6e1ea3c23f3fe25b23b6ea39585e190c840f89d24145d0dc980ea0a5a5bd
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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