Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae709741c2a645b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 23:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 592c024fcd7fc16b757602e8c08da4ba SHA-1: 517bfcd916f7d193a1f8b3fe28b54ab96eba1d30 SHA-256: dae709741c2a645b89b423ad9841110b0ade9743ad3df9272947b9f3ed60a39d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and link farm are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://snieznik.pl/userfiles/file/kufaxixabesubunukuxepapaf.pdf In PDF document text
    • http://yushendesign.com/images_fck/file/1630633549.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c70aa49676795a18a6f99a251b2c1606/joluj.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bexegemob.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109110901069821.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/petotugebugegepivedi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pawirabig.pdfIn PDF document text
    • https://steammining.com/userfiles/file/67892670187.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/sanufujas.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/63276229841.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/10192486757.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63501831368.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/29967232099.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/fagozunanisuluvofakorad.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/46135430133.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a329de93c---71642469046.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/48112341126.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98dd7d490---tosovizurexa.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/lisagadepez.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xodimug.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614caf903f6f0---56181942615.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/fitug.pdfIn PDF document text
    • http://seritour.com/rsm/files/rozigadokogafati.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/40913438557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=police+chase+games+unblockedPDF 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_off0000b097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 10952 bytes
SHA-256: 7212b8c94f1fdd952f8d4fd59d330e26253af465d47a0de0e5e6a036f04468a0
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 16852 bytes
SHA-256: e77b5dba9289d3c70ecd9533320c23f9888db8e5673405967bb717cba3b5de42
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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