Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be384b8d6180298…

MALICIOUS

PDF

87.2 KB Created: 2021-07-06 14:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c1a84d83d1c108b7672327f25c14dfb7 SHA-1: 3af9aec03eb766cc12bf3e26fcdc0d73740e8eab SHA-256: 4be384b8d61802986e9feec7001b06f7f852648fea563d4956b6f558c60b23c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or direct users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://andrejc.si/files/file/48637310714.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fe69081f4985c2bb04cc6bb4b40953be/loboben.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160744fd13252d---livigiwolopat.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/90164759912.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/79668973101.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dnnpiiaf6194qp4g2339eqpd40/fazopimulufu.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/aebd5bf8734a532e0565b07250fb762a/63487135375.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caccb8761fa---16657315132.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5292a6663---5941206742.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/o4643261s9nv7l04hj289t8n40/34055890334.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210602_3EB6EDB253F024AB.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/simopanetoluja.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sofuzamiposiwese.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/poluratosirirere.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b894f7d9---taseku.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ad1eedc7b---luvasokexepazut.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d616f28fc69---tofusixibu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8adb838320fac2620396dedffa007bfc/runozabijamotepakotif.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/vepebufadidodebapone.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecdabbf3e---volejikofitezerura.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/pidesibu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd4d88b8e---47816888626.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/54458009231.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/vefujamuzuguwup.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c5e896a56---vipovigu.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210601082255.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/43856272771.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1n7q3jm4evijstu03dpt4vs1u6/bebiwixumunaxafasurupen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=home+remedies+for+pimplesPDF 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_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10284 bytes
SHA-256: af87b12275963f2a092cca68a54985f057306c114bdf6bd6b9905b692fe38272
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 17332 bytes
SHA-256: a429e14a3f934e919e7674e4138cd49605ef13313fbc2196de90b60d1cfe0a54
font_02_sfnt_off000135be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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