Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbed9d2a2aab07e9…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 22:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fc0976abc44e70799fbb10a88628122 SHA-1: 5a34721bb71bf0be393c61585b03fe0f81615083 SHA-256: bbed9d2a2aab07e982dee8586c8f9bec73e1f11c88faed747c793f388b35b324
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics indicate the PDF functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://rexant.by/upload/editor/files/60404625895.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be06a8299fc---niloki.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0d19eb18---48694834712.pdfIn PDF document text
    • http://elskenecologie.nl/files/bunemudesotoroto.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094676934455---97190063980.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/855emmjhn69pjn64m735m39gbr/kolixod.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/jakugivibatezomujel.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/44731151799.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bae4c4f28---lodosazuvujadesuluki.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adaed5f0b83---rejorutemag.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/rulavezopapuj.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/52905978546.pdfIn PDF document text
    • http://geotersrl.it/file/litawifikokuzaputekojo.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/16620419713.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7aqap67dbfgu5e5vqj0erkkk35/kazenigifunipovivamon.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/divumewixekilisuzomewowis.pdfIn PDF document text
    • https://bselink.com/userfiles/file/munupufabut.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/47edeb82cf8d6b08f927188e0102be5e/85393657427.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/415c1fbe933a312346d50bcfbe7d7687/41559761368.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/91091895673.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36e0b63db---66794464519.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612e03474b9d9---72096095707.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zukejizakuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=portable+suction+machine+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16384 bytes
SHA-256: 82b9eac04cb0577fd2b457e1b901c8896da3c6a447422f8f31d7c1d93820c0de
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10736 bytes
SHA-256: 091358c7f063f8d34b3a011d8f267beeb80ec6bef2d6485026a1ea6fececaa49
font_03_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 19148 bytes
SHA-256: 5d875c4514b51f4786dfcf7fa72b982e857ca1e160241f059cfea2e6903e2b5c

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