Malicious PDF — malware analysis report

Static analysis result for SHA-256 e277f85f5167ab60…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 02:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0423588d98dbef94b5781156c04e7550 SHA-1: b889b2ca7f22e547b555e3b49afc8a7609ff3929 SHA-256: e277f85f5167ab60c0ea2939a379a7d33aefb89868c3a5cbc9787676bab373ff
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories or disposable hosting. These links likely serve as lures to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sportsht.com/userfiles/file/83471415817.pdf In PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/kabufi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/sorifevi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ko64ct02gcvithnfs4k6se6943/13641229925.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/746057894.pdfIn PDF document text
    • http://school15-tyumen.ru/f/58296088233.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zovetu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/69879745947.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2a68aeb6---wukoni.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1308e071c---43650179514.pdfIn PDF document text
    • https://chptravel.ir/data/file/kifubopug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc60807e717af5549d6a0a7095ffc116/resokoxunopinuwatagirus.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/perukajoxizixape.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/60965805696.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5de3e7d70---29088348854.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1896dbd338---66012960639.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/rizudaxafelat.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d5e3da865---53023925843.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/bijiwuvifavisoluliku.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cc5e7884140edd98ad0c09dedec1003e/84809040607.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/fezosesuvuzelamigokibaxid.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d761f0cbc---69459259770.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/50cbbc648ec1975e7841c8ad70cc9184/garel.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/mowabekisewuzekumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=blue+jackets+manual+2019PDF 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 18588 bytes
SHA-256: 66157dc0cc937c77cde84253565da6cc89ae23a6b15ff114bdb9e789b339b2ca
font_02_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 10916 bytes
SHA-256: 00f6fc50c694f3b23925c764104724782fc1fb6a1d0721b98e6cb5f1099483a5