Malicious PDF — malware analysis report

Static analysis result for SHA-256 877467a1ec8e822b…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 20:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f76970751b2755c2beb2d613a20a1cd SHA-1: 7b605804e833b7a4c829a8e1e0f3f37bc4f6948a SHA-256: 877467a1ec8e822b01f7bd2bef95a6fcd24ddc4da2172dc6f92b8a81b9eb9971
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary function appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jubileejec.com/userfiles/files/28961459166.pdf In PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/51409511902.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f93196aba---67486765821.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bcbfa2ff64fef84fc5e5ae13882c92fc/nupazonojavup.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a52e10ff540cc0b4f38560d2f34a857/84328148396.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ccde86a92b2a62d054de81c6c17037fd/mewujilimaxewibadedo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723547c64e7---61956297593.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/wutubagabozugewavago.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/bukegim.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/21510875088.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3f521848916f1a536e68a03802ea46ad/55705371612.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1d85466d---badikogatemakozozevozuki.pdfIn PDF document text
    • https://brod-plovdiv.com/images/fagegetepalazerazegafovi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/20e14a5f67d048b61af95991c0f5597f/35497152288.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9af5434a25466ae60fd4887eda0107d4/mibeta.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/38786905565.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/vesonumot.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/lutowopitozi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/f5dqcfcs5u30skoq5ot1uphpe3/banut.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gaxodabowe.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0044275d2---xosabijekemor.pdfIn PDF document text
    • http://cloverdiamond.com/file/63606939381.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/84805942708.pdfIn PDF document text
    • https://chptravel.ir/data/file/jipolowukexejanotodemure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2nd+degree+aggravated+assaultPDF 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_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10400 bytes
SHA-256: b0d66e0d873f1e5f51fb7bf91d36dbdef1212f6f4fc5adc825255d9ae24a9203
font_01_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 16908 bytes
SHA-256: 135590c6f8210e5f08abb346dcc2e3425735089ec231ef4697d5c5194548ea89

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