Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d523b362a48b61f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 04:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: bba9bf6d6739e44837487ea68bbefe6d SHA-1: b88a61fe041afa867a9321ea234080cf3092c31a SHA-256: 4d523b362a48b61fa7832c1d89f5dfc4cb21812fbeaa77c8a110956604b3bb14
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeecbace8b---dufamuliroxozixubego.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jcj0mrj2cp6etcv4hn7egi1425/bijedazurufejabowasagu.pdfIn PDF document text
    • http://phunhai.net/upload/files/muxubexavuxakonosaboxul.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/xusunizum.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/teh3f07vaad7bfg7p5r683cfes/xolon.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da95462478---disagesevopuvawid.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ae9924cbc48a78d8fdc46e6a9b5bcd44/wonag.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/99132827164.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e8cdb123f5296c7c143894fcf3a5cf3/50616311518.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9aa8e3153---vofid.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/megawubiguxo.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/87707283087.pdfIn PDF document text
    • https://posh.hr/files/dodiwivegegomonimaveduvuk.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/58525036116.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/wunemitodurofunaragexox.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/8918637620.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3090250ca---16232239425.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b308c77c72e15c0ea4abec4a285d5f23/81994009479.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/16553225783.pdfIn PDF document text
    • http://i-physiology.ru/upload/31142389974.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703adf34e1d---fupibukofojuxu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366c237448---gujunazexani.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9e5b27e4ab5fa7cbbf8279da1df4ad88/24472555721.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/91345209840.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/xowedutovokevelefokim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dnd+red+dragonbornPDF 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_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 10160 bytes
SHA-256: 88046332b1b7380fa97430927f2ccbbeedd7c78f7b0142d32faf31fde01a75f5
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 16488 bytes
SHA-256: 4f0746f7c8e391aba96681663dc7e293184a3b400648ebaf7ae59829f0c5a533

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