Malicious PDF — malware analysis report

Static analysis result for SHA-256 899e6e79636c2b2c…

MALICIOUS

PDF

83.4 KB Created: 2021-07-01 21:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 375a69af32f5505f24d07c818b7b9179 SHA-1: 69abf2b324812bb165afb0e59957682151c1749b SHA-256: 899e6e79636c2b2c24a9c0b5991484119614f3c8561c69f73c02c039f2117642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://huntic.ru/uplcv?utm_term=in+zener+voltage+regulator+the+changes+in+load+current+produce+changes+in PDF link annotation
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4170f132e7---xulofalitu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/82445497919.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wamobumamozuxe.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d98042c0---wojewidavikedegodupon.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xejubujemilozezuxim.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1c7bf42c---ruged.pdfIn PDF document text
    • https://arerp.kr/data/file///kusir.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/kovivazawifiluk.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/segipaselutukinosonibefa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5815a762cc---lifezizokatikemomuvaje.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db27515c49---18289936008.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/550144ecaa3a29771ba8bc94f2bc8025/52668957842.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/688ee60e88c9923ce48148c2d4e7d564/29563960611.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4150e314aa---kilip.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/47632698689.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/029ee21bb080caf9c1199c7b01d465b4/bejabin.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/jedigora.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51bdb99fc---4974840828.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a11c90a1028bf5c76460f133446aeef9/36490002945.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/80904846406.pdfIn PDF document text
    • http://iphysiology.ru/upload/38481880060.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/38796468439.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 16212 bytes
SHA-256: a4d61db12daf9f8be302b66f0c1687baaed00f0c0d8d6cbdbfe62e200d0e4919
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 10972 bytes
SHA-256: e4684b1c6531fd8bba19b8b1d0b71b82b6045e28eac5a9a7c84d74094d1226c4
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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