Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f176a24b2dc0a1…

MALICIOUS

PDF

85.3 KB Created: 2021-07-12 16:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 061581f343d3cd26f9797752ca09726a SHA-1: 7f5a761c8628d4a897052406d2303c9f4c03a595 SHA-256: 37f176a24b2dc0a1b2f313dfb72fc290cfff94265a6b3079ad29bc2546181162
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to potentially malicious second-stage documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://scottleddy.net/clients/862555/File/goturikevirinuwokuro.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74717dc6b8---87022211965.pdf
    • http://ithaca1962.com/clients/41687/File/bavudutuno.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b834a1206ed---dasozetuguzixen.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/15399059302.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/74538967656.pdf
    • http://malagi.pl/user-files/fck/file/81767152864.pdf
    • https://accuratesearch.com/userfiles/file/86641421932.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/dupuba.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fofakoluxusure.pdf
    • https://ljlconst.com/admin/images/file/jerudaba.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b1b6e35b57e12d12d4f75df9363daf0e/zetapikidokade.pdf
    • http://dentherapia.hu/files/file/70645260591.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5593893b82c4cb1f2b462d6fc31b92d4/pipeki.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607053ca77652---45474249392.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160deb5f4ae466---50095224691.pdf
    • http://weberstellen.ch/userfiles/file/99884450925.pdf
    • http://jncs.kr/page_data/file/20210528180302.pdf
    • https://aimara-bg.com/userfiles/file/xeperabenepibot.pdf
    • https://akapacha.com/userfiles/file/lerisikivato.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ad49dbaf---dunuderexa.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/093dce06e8f34f4b1ced9ddbe62dfe27/26471011938.pdf
    • http://superplasticizer.cn/d/files/novufibetopijiribototofa.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/07ih59u06eun5tu64r1gvfok26/fuxusa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=scope+1+2+and+3+emissions
    • 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_off0000eae8.bin
483524f42889a366d8c900a87b9721f2813f797a62415b0a614a4cea2f897284
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16912 bytes
font_01_sfnt_off00011705.bin
6c222971410e1536381dda15a4e6996d5ca5e5a5d4c6250ff75f790f6a3c04c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10852 bytes
font_02_sfnt_off0001301a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1301A 16792 bytes