Malicious PDF — malware analysis report

Static analysis result for SHA-256 3036a839d003f190…

MALICIOUS

PDF

89.5 KB Created: 2021-07-15 11:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cb43180c927664be85eb5e749209d82 SHA-1: 8d49edc811e5964142f3ff3a8523343987f36dd4 SHA-256: 3036a839d003f1904a843ac3eadf0b727d6b6fa0f493004c1e8fbe93aa5a2634
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is structured as a link farm, with many URLs pointing to potentially compromised or disposable hosting. This suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://erdemlerkoleji.com/resimler/files/81980005561.pdf In PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/59779530807.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4ca13a62bba9394a4e2f5ac9d918578b/zutujubidadedixexe.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fesogozepemameremek.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/sejujidiludogesesosinoti.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7gutbjjjn50u3up2ehagvs5llm/9735361004.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c2806e7caafdba6bd955d77c05644d66/nezikatezopagunejexelezuj.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/60dc9808cf2da8f735ce46f0773b2709/31140377496.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/sofevisumobapigad.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094091757284---57601625379.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/34854378606.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fe9ba9042---gusifunekepuvan.pdfIn PDF document text
    • http://peak-experience-japan.com/wiwimetuguwukizize.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6cb283f16c7308543b923456d93e073f/50219867039.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4da98a894726bc93975a192dd261dc0f/defetag.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/10ab127854ce20d7e2002afc5e97b5a9/durususarozevidagineron.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/1skp2bsd08nuu5v0mmti8jlhlj/17070564167.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nsb8uktv05d82l98phcs13emgh/zipuk.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282ba22ccd---4948684200.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/98gm0lg676e7c38tci210mev1b/meziminodasidatobasewopi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e130858f2c5---jetenesulupif.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/12662736934.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zofubolab.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/16929825989.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/2380669890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+surname+meaningPDF 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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 17800 bytes
SHA-256: 9528c667cf635d99ce1dc9b972fefa4be5ac9768ef3290be465a7848a939ac48
font_01_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 10392 bytes
SHA-256: 105f33540a2068bcfe6850516181970d651df54c24b8d3579baf6e8d01371a62
font_02_sfnt_off000140de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1