Malicious PDF — malware analysis report

Static analysis result for SHA-256 855c2924e93279d4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 05:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 380462cfa97526206394285c48a77629 SHA-1: eb125edd07c9d20ca9c68964b40549a6b093dff1 SHA-256: 855c2924e93279d477157fd0521dbae91baf511065e0bb2f45c0badc26893707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://honeycontacts.com/uploades/userfiles/file/22249794739.pdf
    • https://holcom-wd.com/webroot/img/files/61497420868.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396c4b91f95---vimir.pdf
    • http://www.mab-solutions.fr/upload/file/dibanezanakasibata.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/wasinigivapufina.pdf
    • http://vimar.ua/userfiles/files/xibep.pdf
    • http://stefanourso.com/public/userfiles/file/86745040671.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0767ce7a---fegetifagorupijosawirawo.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613dffce80aa7---devojipisu.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/rirugenixijox.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/nibotufere.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/xapikizubanapategikijiro.pdf
    • http://poultech.net/d/files/40340096783.pdf
    • http://sm300159.agchost.com/userfiles/files/68164943929.pdf
    • http://djpress.pl/Image/files/laziferugebedup.pdf
    • http://mobilesamara.com/img/files/file/7696335151.pdf
    • http://podarox.ru/public/files/81220061220.pdf
    • http://kkc1.org/htdocs/cljr/data/files/260805642.pdf
    • https://totalsewa.com/userfiles/file/gifefidaxakotukosazeli.pdf
    • http://www.ecostroyservis.ru/File/nonukaxomafimurino.pdf
    • https://millinerandassoc.com/files/file/fijiramoruva.pdf
    • https://loyallcanada.ca/editor_files/file/zixagadafimozizotex.pdf
    • http://dcbestwings.com/uploads/files/mojotuwilupogizeriferase.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/23418174226.pdf
    • http://sakem.org/userfiles/files/sogevovanavubiko.pdf
    • http://movediary.com/userfiles/file/24890466416.pdf
    • http://klhl.com/userfiles/file/50901600122.pdf
    • http://maslatalaia.com/userfiles/file/39476534189.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=show+sport+tv+apk+free+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_off0000e2ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
font_01_sfnt_off0000fabe.bin
f46e7ade930731de795dcbaddd76b24d8979d64575fb4703034daea40c717b52
pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 20080 bytes
font_02_sfnt_off00013080.bin
0b472f693ab445f17913feb20c79ad93e09677f786552b50cca29bf6dd00eb05
pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 10824 bytes