Malicious PDF — malware analysis report

Static analysis result for SHA-256 c732118b168ca8d4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 05:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 443c353cd8fabfbb20700016828d3e56 SHA-1: ba2c7fea7af70d3b77703bef0ec32bfdd613efca SHA-256: c732118b168ca8d4f44a8ee3940871a3e1d1a1c374dd5d5d681981dea8ed0c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://megacook.pt/site/upload/file/zibozowujevafobedekaxuv.pdf
    • http://futuralagoparking.eu/userfiles/files/30592742160.pdf
    • http://sieuthicayxanh.vn/webroot/img/files/belavove.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8ffd2e17---42532959693.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nurupa.pdf
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/zexidatipetexizokak.pdf
    • http://elfobchod.cz/foto/Image/file/kolokuvemiba.pdf
    • http://mexxeopaint.com/upload/files/muluvivegimorof.pdf
    • http://tageedesign.com/ssmpt/documents/file/54062970275.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142172269fc0---gozimisaveg.pdf
    • http://santamariamikado.com/uploads/files/pinizekidozavu.pdf
    • https://aordonez.com/images/contenidos/files/bapasorumixime.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458b9f1ca9a---pureworiwuvewi.pdf
    • http://smenergy.kr/uploaded/file/19945911556146931635383.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///31159015609.pdf
    • http://eminenceinc.com/userfiles/file/junimexajezexivel.pdf
    • http://ymmicro.com/files/files/38351403973.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/66177302137.pdf
    • http://fszhenjia.com/upfolder/e/files/20210901153507.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/db189dfbda11adc0e515d7b4e6d4b3b1/65456582786.pdf
    • https://samacheeerkalvi.guru/samacheer-kalvi-8th-science-bookvi-8th-science-book-bolutions/
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=8th+standard+science+book+guide
    • 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_off0000bdcd.bin
68b420686a27127524cb102ec1b606284a4d24e65c162fa6c9a568cbd0830149
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 11048 bytes
font_01_sfnt_off0000d741.bin
90a40e1727465dc50031ea8478ead8886d14c25828d6b3ae67741b51309b2efc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 17928 bytes
font_02_sfnt_off00010605.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 16792 bytes