Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b56ef35fbcfbd7a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 07:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a9159c01e579d8e99abb69c2fbfa187 SHA-1: ccf434109318df124900a0a64ff99773376962f2 SHA-256: 7b56ef35fbcfbd7a04c2c96ceb9135342834fc0b925b74c080a06a7d1fd66179
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the nature of the detected heuristics indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.radio-kum.si/data/files/petamol.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aa507df1---48831324640.pdf
    • http://bygreenpure.com/userfiles/file/kupolovogiguzukorefor.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/16395088467.pdf
    • http://mtsskzy.com/userfiles/file/75942893268.pdf
    • https://divinenine.net/userfiles/file/30705302854.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/620e38545455d0f34ac014d04071232e/18252738909.pdf
    • http://galluccifaibano.it/userfiles/file/saxutana.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0b24e3946e2013e79a48938dd6bc387b/narajir.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/1f5f7do9gtvetenbb2ckuqmvbs/salaxorefosume.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/dugakuwopigujo.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e03227f13---tasirafexuve.pdf
    • https://houstoncoinshow.org/FCKeditor/file/41961085853.pdf
    • http://korean-school.hu/hangul/userfiles/file/nefiwimekafo.pdf
    • https://tessuno.com/upload/files/612db43d6ff42.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd47b0857---pufawegujojegepalo.pdf
    • http://imailbox.nl/images/uploadedimages/file/ruxojolakigalusalopamil.pdf
    • http://ruben.pl/ckfinder/userfiles/files/kosabolilo.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f78a752c4f9---zoxitevonurofijidigijajuk.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f022920b1e---79315207962.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/42fad6575995f0fa524b6816e7aa86ac/14055967285.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115faab05407---sunuwarapepafovanul.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d11220bc7---mepizatibetinitif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pretty+bank+cards
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5e.bin
1202f7ae841e0e110267f5e663e59a087da93246d5319f40db480e137a80cdbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10452 bytes
font_01_sfnt_off0000f34d.bin
24607625e5d2d7c007fbdc0b2a330c029a002c33d3c058433c2cdab96c688ad4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 17464 bytes
font_02_sfnt_off000120c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 16792 bytes