Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f11e42e981c9ee…

MALICIOUS

PDF

88.7 KB Created: 2021-08-09 06:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9e29b549e19d473f258b34a76423af94 SHA-1: d4b576d01f5cddf2e58cbeb10a627b04a091684f SHA-256: a5f11e42e981c9ee9aa475cf4fc7e6e92d2dd0eb1fceb14e782d43f99e52f138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to a variety of websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=how+to+open+a+coin+laundry+business PDF link annotation
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26527964213.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/707c028102ce3817217147c8f5c248a0/funemoli.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/nejuxa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/52beb6517b302b2b0e6cfbf0443646b0/vulepimutetisusoxuxozo.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/polibebeza.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4qkf1ponfuh8ns2o5uo40s7dp/65460557437.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/2008698627.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1889929cb4---24755666268.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/bowagakozefojozaku.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1kuqh1qhldvvbjk4budsddjrnh/wilojerejuxuvemoxes.pdfIn PDF document text
    • https://coevent.ru/upload/files/64624327216.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ksq67q7unvtu66abm7nom601u6/tirojozolodutezupaporafe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a5f286a1---zifoxezesareluwonum.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/49786d5333ee91313ee800e0850c3016/21535593395.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c26b40cc48040645ab2db034e2b6496d/96704061373.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0819a2abf---91358500839.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/68140278941.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1dc98974c449a854ea7a0c3d546a9957/98065025843.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/63209058127.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/tejub.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/23401647058.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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16472 bytes
SHA-256: 2d42cb718160c01f2f0f2ec5f7375b5e8ec1533b42b45bb8279c9baebf7af0a6
font_01_sfnt_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 10936 bytes
SHA-256: 9d630859274f42fc41c8b80b9a33b404d9ce1134513458a72c6d016e75b0ba2d

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