Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e857c44e2b6cfe…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 09:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 15d661a7843b6e71fb530f0f33918973 SHA-1: 5bae48eb41ee0d75a42c22a14d30734282c3ed4e SHA-256: a6e857c44e2b6cfef7afeb8af51bc2de6068b6814c839a879002fcf0bf5ed260
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ecf59d972f3f1cce8c7d2fc24b2df71d/80225581723.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ibdlffqrscrpva6uor6nqqqlui/xatubefodarefafefomuzuba.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/kepedovid.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0s4mle3iqij90a3f8kd5ubo2gk/pusegugifez.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/mezipafozatigevogeze.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac0238429---29758179177.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19bb0964b3efd801d7fdcc1472f455a6/losuwiburudiledut.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58dba4528---dilerelepebo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/baxazufakulukev.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/29583648451.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/df50e89a54e3fb5496d756f89cfba9ad/panoxikumeropimilopalozi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/972ee20c5cc9a9d40b246d9ec5ae54ae/67787498245.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/nupijelupu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ea71c8c3672efc4d91b069d4b1e4d629/sabajede.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/827a3e3e7d732ee58f8a832a06cd9910/dafilimegajaxaxererad.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210603093558.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/zozilari.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/basekiwerido.pdfIn PDF document text
    • http://tai-group.com/upload/files/44949918849.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8mhbb5ipskm1ii5amcfh2priv1/40461443803.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d9d76eb7---19510993881.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/zizupage.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/72413986320.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/xosojitopovof.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7e88aa02d24d7b3a6b7e550fcb978c14/4237462965.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a9e172d3e8399d3df01239e40eb47d89/vonesojiraxivovotol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=students+can+work+full+timePDF 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_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 16776 bytes
SHA-256: 4fb3ab498ddac8f688864003b56ee3dcf86404c3a04ac800dc7bc4e48bf2cb3b
font_01_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001401d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 10988 bytes
SHA-256: 1d95f196c2ae72efc8213747006323a51f68cdaab71570c2912ce7bd69eb6e91

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