Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbebb6523ab76460…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 13:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5325174c6278e47d78800055eb373609 SHA-1: b945dfe05ab4a75456a5d46e9aca2f3e93df2974 SHA-256: bbebb6523ab76460c52b838fd23a1a93665a48034bf74813b0fe16763bfee560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing or trojan variant. The document's structure and embedded links suggest an attempt to direct users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://adaviestransportltd.com/userfiles/file/42569601782.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd33164861---kogukudolumaxofifodaz.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/94437947761.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/xukupebuferutanajipujo.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/selajewidadumal.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/kagasipavixemomudibuvoti.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0c82bf4fc7094f4a1d8205c32049cf95/44567509502.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sigurapitilat.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/31651554646.pdfIn PDF document text
    • http://195exim.com/datas/files/diferukapulalurapivaw.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/modosugafuforidedalewetid.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/27967048491.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/29276569161.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f5d7c9f1---69300285706.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30d1d0f6f---27275748833.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/44739881320.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e243e821c---87703333263.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/pikewud.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/solofagamelowixesan.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/66843188640.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/3011369486.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49ef467da---12437618137.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/pafazob.pdfIn PDF document text
    • http://kelsenator.com/userimages/jawopilevudogob.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/70802962817.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/nuvegegupitapuk.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zovogefes.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/58995898758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=airport+city+cheats+2020PDF 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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 18028 bytes
SHA-256: 14033e9dd8b9fd89c18ff37d782dac7b1cf373273c832afd576a32b99d4c18e6
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 10660 bytes
SHA-256: a695491ea367f3784b6bb435bbf0b84c4f697aef414fe45c561033c692ab7ba8

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