Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dc1fc5b5faa52a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 08:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48a770ad37d0aa80c69ad83c341fac9d SHA-1: cba54f1ae9dec9c058be0db45104c35bcb1f07a0 SHA-256: 81dc1fc5b5faa52aea469179eaae08c7fc0f132d7e825a57409d4f089eb312ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which are hosted on disposable domains or compromised CMS upload directories. The primary lure appears to be a download for 'facebook page manager apk free download', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=facebook+page+manager+apk+free+download PDF link annotation
    • http://instalace-charvat.cz/userfiles/file/tumugofuriziv.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/14651902790.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/69675524825.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/ponewilaxopajeresejog.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/68255946568.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fikozujib.pdfIn PDF document text
    • https://iwistw.com/upload/files/61984560218.pdfIn PDF document text
    • http://portableandcool.com/files/files/53297149333.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/vibawovelipubetalozuxe.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1sd5cccu2dtv24t8n7spao3q18/memita.pdfIn PDF document text
    • http://ciskmv.com/css/file/45411219267.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907210035298719.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/83455100859.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/29508778867.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/87578121496.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/regefunujumujufonevefowa.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pupadopivazamaj.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/77499224101.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/7390730284.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/jiserunivoxoduximej.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/jiwalonujufamirekil.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd70141b5---28049797840.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6fe2310a6b6e61309ab0444106c5a9e6/pibemesebewi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bbcdd816---mozuwakiwepujup.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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 17556 bytes
SHA-256: 14e63fc5dc34c74ad3a77b473b8cb7d7fba2615a7655279446b05ed1b33dbf71
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 10900 bytes
SHA-256: 1bbdb9a0e59a0153191655d599701ba9768fa276c4b5a9008d7021049d769bc6

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