Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce350db803e0757…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 17:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78706fd2b929198016ba67276f064d67 SHA-1: 0f046daa553f44254f35b7ff58712f33c8081357 SHA-256: dce350db803e0757dec18422a852385762fee4bb577631e534f47591aa3daf49
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external links, many hosted on compromised CMS platforms, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a97594ac---weluxubugopelirosowexezok.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/3ba78bbbf3af3bc7a4cdcad55584ac88/vepedijujiragelegoxiku.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qvac7o9qur6pbvihmthp9qe8p5/44912845886.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b10d638afc---vidutesezabixuvafemaw.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/35605115207.pdfIn PDF document text
    • https://labelmarket.pl/data/file/8684208845.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5e6io9r4k0u8ugmavg67vf1n45/12941436409.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/lotezibizotugapituno.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/23866604158.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79c191239---62612525681.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3ohqblpqqct5r9k9ramsehlk87/wenakikokenu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8895dc61d---50818256.pdfIn PDF document text
    • https://airshow-bg.com/file/liboxobetulalu.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8a4062b9bdffeb50a4c705150f1db23a/maredolilabodiw.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/65238700460.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5232eb13ca---niwitewalodivi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53b3dd34e---rutubodurupave.pdfIn PDF document text
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/lolarekani.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210801012938.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/67174672753.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/80861481586.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/35897018550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shell+rimula+r5+lm+10w-40+pdfPDF 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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 21524 bytes
SHA-256: e5b98099f0a3d3ba4091a9254ca6c07de439ce653ce03240ae10d005118f837e
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 10956 bytes
SHA-256: 413a22ece207249ea91c9022807a2cda524f06c121191f196ef7e343b3433c3a

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