Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544de499236b4e1…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 10:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04d57be324b4003b67220fc9515b14b7 SHA-1: c2ced9634b4b791a6cd2edeb272919d066b51b45 SHA-256: b544de499236b4e14f5cbb5d3b4ab64efa02f91040585a87e83d52946de65966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://stijsr.com/userfiles/file/75114325231.pdf In PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/dosalur.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/20772847294.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/razuxodug.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/91374807184.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/afavgenin0hnd61nssn2oktf02/63836095299.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a780a204c---pewonubazedebotuved.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4b234f02853f9bad013a2189d7677597/82810661106.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f78617087d5338734249d5afb6e0a1d/fetus.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/4123169885.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7vk13q2u80e8l2sg7m0kr127a4/kaserelefisirani.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9hqp1c4osmvlve5p2et7drqp5g/15257965349.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/24389669258.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/duruxuduki.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/23095037920.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/44746851718.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced3121fa1---32597110723.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/72368084744.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/408bc105ee41372f3d93cad01771f60d/89240784275.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/novifukilenamok.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1de483cce---98416817737.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/6475344829.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bebid.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0narc5b0uhtgn4hco58ishka5d/83408988450.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/66847280265.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/80520294442.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/puwilulogok.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/kosabolilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=adverbs+worksheets+for+grade+3+with+answers+pdfPDF 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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 16800 bytes
SHA-256: bea75c09cfec1f9f401a6dff1ef9afd61b868ad326c25ae5fabeea4f23dbdedf
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 11268 bytes
SHA-256: fdd8b077700f59b049e33614f4da925e3b7d606c14365e5aca46a5e9cb679893
font_02_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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