Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc340f19f37471a0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 14:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b26daf77ab1ae0446764b6b0172c7658 SHA-1: 2aea7f9cf2900ef1226c59b63a6850224ff292a5 SHA-256: dc340f19f37471a0f118b9c67a15464723dfc7df3b50cedc7aa708b3dde0083e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest the document is designed to lead the user to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bahattinburyan.com/userfiles/file/lavuwolaguzes.pdf In PDF document text
    • https://familienbilstrup.dk/userfiles/file/jerif.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/71213522407.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/73870731131.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/94167785957.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/wepowil.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/pegiremu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nuwabavipefuxipe.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d249c1c058b---puzumolirasosatinetovozo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/wolezukilu.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/razularukatonet.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/rejubivikadebunev.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/391b70eb5bd79e3a3ca1a918923e7730/rivobovitixenemewuvi.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/garowejijepasoleguser.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/zupebitatetariwigorujer.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/9161893735.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfac0cc1ed---vixejonatujeginogusewav.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69bc012bd---wujodikewu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160932f8268be6---99545518538.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/taremugidinosimepod.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/85168298319.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f71933218---2120205082.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/divibuwavatemata.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210726070951.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/28742484004.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eec62a24decee65d0f561f5e2d63560c/72007496249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=police+constable+paper+pdf+2019PDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 17876 bytes
SHA-256: 34264ea433ff69b692c0e5dbf1e1c5881629152bc0a0d419730d983c85a2128d
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 11216 bytes
SHA-256: 98eff042b884338639e5d1a918edfb3d6fa2b836192264fc5a8f51695862c967