Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9389208aecc8fb…

MALICIOUS

PDF

92.6 KB Created: 2021-06-30 19:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f43f0881bfa6bb54fb1e337acd78ac8f SHA-1: 0f255adfca08d69e1dd92469675395f1b366ea1a SHA-256: 3c9389208aecc8fbff968fc19293750bbf7eb5f1c15caba3cbd283ecdd21589e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are indicative of an attempt to exploit user trust or curiosity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bgok1q88qou7qkf8u0vlf6j872/58152123865.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bed7aba4ee38e2fe6bc1024039e94857/63841384254.pdf
    • http://kssi.ir/public/userfiles/file/duzuwazapixemovov.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/33744490880.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160805d6d6f4d0---34457146532.pdf
    • https://zlatartopalovic.rs//files/kapudotavujuxiwotolunezo.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/60148818630.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06c49ad14---gogezot.pdf
    • http://nfc.soo.jp/file/jokiv.pdf
    • https://sgotomotiv.org/upload/files/nefoxapudozi.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c8344237---bevarosavulovomulezunato.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d0b7cf16c4ef05a3ce791d767013e520/rakafifotidupad.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eac2ed3c1---31632228516.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/satasaguvelowetu.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kogubabevozufis.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1ab24b27---sajiwor.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c247559924f---lobakiwikolalera.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7759abc4ebd4df176334557327d36678/43985912493.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/012e0c004dc8f65bc1797a453365be5f/17813596377.pdf
    • http://j1medical.com/uploaded/file/48316531693.pdf
    • http://beiwendq.com//data/attachment/file/sikepojagovejevutew.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/85e37f2e59f3968b9f2ea1ebb894de35/danup.pdf
    • https://aljuboori.com/userfiles/files/36397502619.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k82carvag6dl7vbcllach2oppn/93462447594.pdf
    • http://ankurgroups.com/userfiles/file/pefuzumapoga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+does+the+impulse+momentum+theorem+state
    • 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_off000102b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 16792 bytes
font_01_sfnt_off00011acf.bin
0689ce5c8329ca95f8994069cc43d89eb2889e79119164c7edd80ec0fe446e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 10748 bytes
font_02_sfnt_off0001334e.bin
d76466fd25e95a0ebd71b6adf8042cb470559ca0268c5e9d12262c864708d657
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 17952 bytes