Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67dd059d5a08343…

MALICIOUS

PDF

79.6 KB Created: 2021-08-05 21:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 47ff7585d935c80edac2031a162c2f49 SHA-1: f02d3cf3b81b67dac6f9d8f79429b0f7c20bb84d SHA-256: b67dd059d5a083436037e44884c63e7260047e24b4e94e9e56e8adec87fbfedf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to external sites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic firings suggest this PDF is a link farm designed to redirect users to potentially harmful content, consistent with phishing or malware distribution tactics. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=medidas+de+posici%C3%B3n+cuartiles+deciles+percentiles+problemas PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606e000db812e---84303556863.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/donat.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/85937717889.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/tilawepijesixo.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/67413123911.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1233eb342e4a2955d3b8b8b67eab1c30/lusolukiveku.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/87469447937.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rar8ndceaqsp269mr35rmvkrp2/75137586557.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/puneb.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gj1n39rati5jlu9akd703hqg33/geporur.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1ec798d77a46ac76e6762c296698e07f/80945418376.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4557661a52---komelow.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02c7c2cdf---93238248035.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5326d1fbab3936f3c40efb368e708850/19770351953.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210614/0936549628.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/aa8q92arms9g612ubkbh89sjh7/wuvesu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/42735141942.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8005be359906735fa0efa254544946b0/9017815892.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/26337763617.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/dapegimoretebasasub.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210512120614.pdfIn PDF document text
    • http://air-ned.com/uploads/files/56121890795.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ltc7iqrp73gs457e7je1vmi6gb/21437665747.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b049155366d---49758325120.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3f585bef641d46d1096949c1fa133e28/dekawozax.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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 17228 bytes
SHA-256: fcf676dcfe2732ea8c1fbc286c43c2b1c4ced624011c5aaf0e8c359c212a0638
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 11044 bytes
SHA-256: 4015f516680794e578832bf630232c5a8767a20c1c662ab28400e21ba75d67d7
font_02_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1