Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb961ddd5043bd9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 19:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 493f08bcf2af248147193d152b41a3d3 SHA-1: 24e929f08c224649a1c046cf43f6e5dca5b948dc SHA-256: 5fb961ddd5043bd99f0845072239190e53e7ff34e38f4e2e80338ecbccbaa789
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF download links points towards a multi-stage attack where the initial PDF serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://qataminational.com/uploaded_files/userfiles/files/pufixukezinanadifod.pdf In PDF document text
    • http://inwallendorf.de/userfiles/file/42691601581.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldkevf4jjse93vv3l1bpuvbi73/9641257686.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/74617996224.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/finamopafoweb.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087741ed8303---37610636406.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a14bee37316---zawukini.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/lanifavavaretapizazawed.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51dd61466b---16699987622.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42d8ec468---30056435038.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/27513176214.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jazokodugajurofatukuger.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/motufomutemefagi.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/0af5209003f119f0ae5b4e53b9c9d81f/23551144479.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6252af2e5---jigakusoxejejeman.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nelulebaba.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9a7d7f5a---39984394114.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e38e2a29a15---10702153828.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/roxofoxonopumawigelopivu.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/luziv.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/kosowirupezusotomobiv.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/29ac1485fd773fd4b87722ba8bf00186/73713674200.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/kabugifazajudagoviko.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210716/file/1626420709.pdfIn PDF document text
    • http://mega.kz/media/upload/files/rijaxutakuduluju.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210602190057.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/41314965057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spelling+skills+grade+5+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_off0000b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 16228 bytes
SHA-256: 28c083e6adf9d449557f1971cd394d3e58aa2e43f504b551bba6e7327c041fda
font_01_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10756 bytes
SHA-256: 8ba094166942e8057a103758027042ef1bb446b3816287f15b9e9f9f809787a5

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