Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a748498249b726…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 14:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3573381acf3b9b099609e120f2ac4bd8 SHA-1: 573bc340591495c9ed29148d6e9fca7ee714b8d6 SHA-256: e3a748498249b7268a8df3f8ebc3045666bcddb63e2447451a04d58d2706bda9
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to lure users into downloading further malware or visiting phishing pages. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c266623e3---fajonofo.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d168029d4a---koxarizizimaxelobubozenef.pdf
    • https://akproauto.com/nbloom/fckuploads/file/lilijifuwobodekeb.pdf
    • http://vidol.nl/userfiles/file/zizajazoxutinasexigexu.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b419728bd36---kesewomomegim.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/43368397258.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bacce1b68---fudorixoda.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2492e59cb---mesidogajinizifaxamexan.pdf
    • http://agataklimowska.pl/userfiles/file/68686145648.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9ce9275799af7aa7938bf4dfd253b0d0/5741707774.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/782b6478e28f10bd00d32aee790372d8/fogoruzepupuwutudotafuw.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/46f8489af4ed367a90bf4d9875c7926f/wixibezalaxalivugepekanu.pdf
    • http://noddy.nu/images/file/66661562497.pdf
    • https://fajanav.com/aym_image/files/48735885820.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/948ed81b3040c768a71373c1e6e6ec60/vopowifomokoxab.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aa5145ea---34193966730.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/nejokisune.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8b1bc0b9d---39867860216.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d1fc80f1170d787b2e9c2ee8f9258144/milobosixodolaxomilo.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/fotvj6cp74elp6kl53iet3oa5f/bubewuparebixi.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609169a08e6fb---fumemo.pdf
    • http://autosoftware.company/autoresponders_images/files/7697354015.pdf
    • https://abugfreemind.com/userfiles/file/57021723818.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5608f138039d1a2a2a4afebebd9171b/87265008510.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e177a4fa5e---gofuwasotapogerulugazopin.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/631bfc5f9ca5237491b24c5b4db3b67d/suzulewuvezuzizob.pdf
    • http://ongnuocdenhat.com/upload/files/jinexanumo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+glasses+of+water+is+75cl
    • 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_off0000f294.bin
f19281227b7ec2fdaa4750113f465c24ab107c38834b1a7776450a1d2929caff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 18012 bytes
font_01_sfnt_off0001222f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
font_02_sfnt_off00013a46.bin
7ad11826b3ca33fd7fbf72d08df19c13d89378b098959669955e1fc4f1c80eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 11056 bytes

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