Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a19221a657e7d66…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 05:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c560c3f90c93c5e7b6df23bda51e3163 SHA-1: 9f6b330f102fe92ed5f5ba85b837c726e7c9e08f SHA-256: 2a19221a657e7d668dcaef270e4628ca40d3691edfe934c14f48886c23a775a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various compromised websites hosting PDF files, likely as part of a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of 'risk management job description pdf' in a URL suggest a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marinapogon.pl/upload/file/76186629870.pdf In PDF document text
    • http://radyoislam.com/resimler/files/56274420884.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3447b24627---37716037610.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ede297fda---wajum.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/83922879429.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094153f55be6---domagikoverarim.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/74d0407aa40a213995b0303f575c5fa5/72425540725.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/61961419959.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/buduzorozez.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62e66831c---9130982257.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/85414649780.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jedepezebu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mpik13r4p3e289v6tb7n88i49m/gomenosavogimonamukejo.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/83960090262.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/kuvokazimuxakufarif.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d3a4a4cb---44712223519.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/radatapobiti.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/93320622702.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5e2f0ae8819343bc58018fbd7c6dd731/wedarosojik.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/39802788354.pdfIn PDF document text
    • https://diphong.com/uploads/tixakuguvefila.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/zovepajumiwitaxuxelor.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/92224546059.pdfIn PDF document text
    • https://polaria.cz/images/file/81706669236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=risk+management+job+description+pdfPDF 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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 11324 bytes
SHA-256: 9c33c54bbc1425e8b3438da3f0114e1dbb159408e0e82b14f1e824e57b6798f5
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 17384 bytes
SHA-256: 8c94c7dab49c43505360ce1a0badc91ce23812110e6b15a568371e5e5eab49d7

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