Malicious PDF — malware analysis report

Static analysis result for SHA-256 b788b769e2efcc5b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 05:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a3f5ac21321d3fe6a0315b0745a265e SHA-1: b5e4f56061326cb51b21c0ad8622b637c983eefd SHA-256: b788b769e2efcc5bff7c385c82a51bbeec6b64d20b04f3a253a9999535194cf0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=2020+honda+accord+sport+2.0+manual PDF link annotation
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364495fb7b---80803631680.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/13911927119.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/12920046908.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/98462974061.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/87645f88b2b2dfad43e6b7682b20cf4e/1152684309.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ce3d3787b---12606188667.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/16707193045.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/81196573724.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a88c9992a---59735018665.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/42210097118.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/kuvesuluminexulelo.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/mefuzuwebuvumesezejid.pdfIn PDF document text
    • http://huntland.hu/upload/file/28504348833.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/luboladudo.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/79113498032.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4764f40c7---pelufarefon.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/56953831746.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a52967e8908462b7465296002b231434/89386818649.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/binevugulifekab.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/womujovepudodusuworo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/zareduj.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/muwiruvisuxamete.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/98434733510.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/losoradonomabapugenavuv.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/33106020071.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bac998054bd---22804328513.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0dc0dv2usdg8roeenilvkvmur5/62151856986.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 10868 bytes
SHA-256: 7c53ec794b0c84f185340ad1957aeb32c7ee3baff44e9c92bb471fa6ac147804
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 17632 bytes
SHA-256: 7970e9f73d70de2eeca09c468f96b9642328f4294a4994d84fe090aae1d27875

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