Malicious PDF — malware analysis report

Static analysis result for SHA-256 67168babd90f15ec…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 12:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79e5be5137454efb1ee124ffcc0e7d89 SHA-1: f81b5014537d8374ec06f5229e14b462d1b65a9e SHA-256: 67168babd90f15ecf10679b76221c977841f57b299f3caa39ad60c4970e7ed2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://garglob.ru/uplcv?utm_term=rukmini+prakashan+book+pdf PDF link annotation
    • https://electrabicycles.pl/app/webroot/uploads/file/16276587233079.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/72814411017.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075baad6036d---95663328419.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/70390644695.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/95372919417.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779e62659fb---sizibedakud.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612755afb2b9b---bavademoruzema.pdfIn PDF document text
    • http://ud2-140.com/files/tulusudotigetexaturitog.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/fa9f6f59afa0d5062f57afcdc12d45a8/40976403177.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fae913a6e92c736e1bbdae3c2db257b5/lirifavibosovekuporimoje.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a12434620---zivixutagodofemiwolafove.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/71582262574.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107300509499693.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ae24bc6a94fd2943f501d42e95b3438f/xuxevofenawovas.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cea4619c72---biravutujapavosefavowez.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/49438023909.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/75850872576.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96b9956f7ac3dae3d27b3836e41624e3/20740290732.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27935003246.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/97471076333.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wugatugukamurukew.pdfIn PDF document text
    • https://binhvi.com/upload/files/kosudekoxosunirobo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/bawavite.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1c3df337bb1c43f5138fca00ccad6dab/74312399807.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/wefenigub.pdfIn PDF document text
    • 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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10864 bytes
SHA-256: 7e300af341423b1bf1abf7f055404793ffcc56640f447a6e9821b27417c66929
font_02_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 20892 bytes
SHA-256: 3464e605a779dcd2539209d9fa1ac515a9a8df05a0244b9ce655480e4231f575

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