Malicious PDF — malware analysis report

Static analysis result for SHA-256 3928561fc3061e80…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 22:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c59c69c47bb3c24824a9f9a973326de0 SHA-1: 8398c70681b10658dac004f4e2be47395097495b SHA-256: 3928561fc3061e80b47ed8db76d528d150a67c834acdd1f3480883cf1325918f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised WordPress sites. The presence of numerous links, including one pointing to a compromised CMS upload, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://studio-orlandini.com/userfiles/files/mowawuzijogokoja.pdf In PDF document text
    • http://constantemails.com/userfiles/file/1631321903miletizoluzup.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/89021192987.pdfIn PDF document text
    • http://gr-chem.com/upload/files/93604387313.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/losuzefazajexikepidasap.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/61600879717.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xamukulowekabojuxu.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210904205933.pdfIn PDF document text
    • https://baptistfriends.org/media/31679179338.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ksh47lhe9spemd8inthk8dj47c/45463334572.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/wuzabilavigilusoxu.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/mokexokusuwubazel.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/miramamazariwatamutetume.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613546740e630---nozasizegasewebo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6fa551f6---vesamureje.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-7/20210907181950735364.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/57881572685.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210906230837.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/paved.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/woranofijib.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/xajutozofaze.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebe78c30b---16807946021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sprachsuche+deaktivieren+androidPDF 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_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 19160 bytes
SHA-256: 889e88a1ea30d94b1bf3f97c010d74b0d41f2001b5e4eb8380abbaec2fcb4814
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10900 bytes
SHA-256: 63e4886a187cb050a0c4140802feda1116e9d4553ae19265871e932ded372bd8
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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