Malicious PDF — malware analysis report

Static analysis result for SHA-256 990e93171f7388cb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 14:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9792e9c83ad3a49b5679a83a2f0ee8be SHA-1: 8ff54acb1974d23bbcde8f172494de1e5af25d8a SHA-256: 990e93171f7388cb1b48d23e091116ed069c9e3f61f31092f046b2391c94e22d
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://garglob.ru/uplcv?utm_term=android+add+to+home+screen+icon
    • http://netcentricnj.com/ckfinder/userfiles/files/volovagogupot.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161301bd84499b---94025863089.pdf
    • https://www.tunnel.de/files/uploaded/file/86045515978.pdf
    • http://cameradungphat.com/uploads/files/runiforitakikajujoz.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139305254cbe---xikinelojezegosazavo.pdf
    • http://eviljoy.com/UserFiles/File/gojebimonunitijaselarug.pdf
    • https://duongthuy.net/userfiles/file/7922035612.pdf
    • http://garmaclima.com/uploads/ckfinder/files/daguxogofomarul.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139db2f5f07f---99386340736.pdf
    • http://orem.mn/uploads/files/71358946422.pdf
    • http://eshop-kocicinadeje.cz/files/file/86360267259.pdf
    • http://marketypik.pl/zdjecia/fck/file/11692712534.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/26383330068.pdf
    • http://lotusburbank.com/uploads/files/62193877393.pdf
    • http://ntep2008.com/UserFiles/File/venimamogesetunavogipiwu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdf
    • https://hatinhjobs.com/upload/files/78506532895.pdf
    • http://limuzine.md/userfiles/file/50772594040.pdf
    • http://imi.vc/upload/files/89725673180.pdf
    • https://fong-cai.com/upload/files/xegapamo.pdf
    • https://plewmal-d.com/Uploads/files/59259483520.pdf
    • http://alltimescare.com/attachment/files/ginoponusipamukete.pdf
    • http://benly-carson.com/product/files/37604792781.pdf
    • http://kientrucsangtrong.com/plus/files/bimanadi.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/66118181905.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/gasadofejosokonudo.pdf
    • https://marblobathware.com/app/webroot/img/files/72897616275.pdf
    • 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_off0000e09f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16792 bytes
font_01_sfnt_off0000f8b6.bin
99f7050897b85663f78173291421c229f6aa35a6a79e60f1bfc885b245827866
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 10568 bytes
font_02_sfnt_off000110a0.bin
d220007ec4d8a23fac4d6579ba241650804c3a163b99beb33ddeb588e1529743
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 17608 bytes