Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d6348856131319…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 13:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7994793f66c6d7327d8f7630998cb18 SHA-1: ac7def2857fbbe33f3a5f3620e20a9a44f3cf20e SHA-256: 62d63488561313194e162c7376a9673169a146ac2a54cba70b996c3f8abcf689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://lehnerkom.de/images/uploaded/file/gozofin.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f014c441228d7061f3fd718b9c3800ae/bukiviwusisawu.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/movulezukofofitanati.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/buwesafovevajigakarezutit.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/2983588511.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/53367051027.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/bulajerogegu.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/vegikorivun.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/vimamitamote.pdfIn PDF document text
    • https://ms2oke.com/contents/files/puvifilakapazajagibi.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/72018387483.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109111959444881.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/pudab.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9d023f1df309264ae70bd6de2b1ea2e3/19927205865.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210924080000_o2ki2e.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/84983535170.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/xesofejewemewojunutuxe.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/1654486752.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/11574250232.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/409194518.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8225ee4b---80391083617.pdfIn PDF document text
    • https://tebra.si/userfiles/file/55106422070.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2a6699ec4cc6d7b21bc8b74f2074f62f/kezuduz.pdfIn PDF document text
    • https://network-italia.com/file/najapelugoxiguzajikitik.pdfIn PDF document text
    • http://generaldistco.com/images/file/52969256315.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/72606827449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=most+popular+android+versionPDF 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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 10544 bytes
SHA-256: 5b13732fa995e18af87ada38cbaa42ca81658f4b55fb0ed06e9888c85a006ddc
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 15540 bytes
SHA-256: 255be5f5507be1b0738b0b1fee4691f75771481cc76f6089c9a87076087769ce