Malicious PDF — malware analysis report

Static analysis result for SHA-256 5515ecd18618dbfd…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 21:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f4d4f0dad04e054cde95fb5c685b9a5 SHA-1: 3b8a6a12be3d8343531b9811c4ce76cceec74e2d SHA-256: 5515ecd18618dbfdaa7b25b4932b073a69faa3bb0556dcf5e11ed86ab8b1168e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised websites hosting PDF files, likely as part of a phishing or malware distribution scheme. The presence of invoice-related language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1b84a6422cc9178f92db8618ff9cd356/31555569439.pdf
    • http://agcslohian.com/userfiles/file/xozadib.pdf
    • https://alatheir.com/atheirwsfiles/file/sizorar.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/88o68nfl94os8d737ioujmh534/227243944.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/30682842668.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a6c4b25769da10e06c55aa946108fea2/gepozawubaxa.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/da00db0371f881e7e13514a32335a907/vijidiwibix.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9131ce78f---mupefibamumilafilone.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f085ad865b---nobimewes.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/9756396327.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6b31d3984ebc50c44ef5e30c9eb6771d/zevage.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2f046820b33debc9f406f5331357029a/liwuvigaros.pdf
    • https://synersys.fr/contenu/file/lipatoduwajumi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2c2b2eed4e5bdf958d98c9d1fcc63d73/29472317394.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/788910a74c637c64d480a250fde87712/34740825957.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444fb714ac---tededowujupitekokavike.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbfed537bb---vebuxekepoxuvufazisaf.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7121b166f84b7b11f6cd4003772cc205/39561447147.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a726071e1---karoxagab.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/94g8r94qejivchgf62qqqcni75/56025631400.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/38812685685.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/sdn2dq16ftec6rofqbpf3ulos3/juxowa.pdf
    • http://ahcxdq.com/uploads/file/21140250119.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/49147620630.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=neet+previous+year+papers+download
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23d.bin
f1ead7fce8b5b4d6ddacc54c801c5070a1c1e09de3485a856806b72e83a586d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 10728 bytes
font_01_sfnt_off0000fb15.bin
16cf8c9e5028c6fb23c8c55006fc81a138098da9574ac1d8782e4ac43103ef4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 17484 bytes
font_02_sfnt_off000128e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes