Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06587375a2d04bf…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 19:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75fb1e13c518d5fb7ef67b53a4d15351 SHA-1: fe46b51cb7193eb9e1619b9a59bacc34ceab1c49 SHA-256: b06587375a2d04bf9f0161bfe1d36fd4a504154bd0a0de2cd851ff8f99303ba3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pixomot.ru/uplcv?utm_term=android+animated+icons+library PDF link annotation
    • http://lifeline-sports.com/files/file/zakebigojajimir.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/rowoxulivudozatireti.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435ef177316---wiserubukolun.pdfIn PDF document text
    • http://partnercable.com/files/71492042016.pdfIn PDF document text
    • http://becucci.it/userfiles/files/mujalaterixuwonufa.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/13366487348.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/72672506709.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_82597C0B716E00A9.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1if0vno72af34kovmpi3fda4gg/54178397463.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/86997937b0ef08558c8dc8639632f566/78576246903.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2109120112303959889807d.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/68975637370.pdfIn PDF document text
    • http://rnralpha.cz/res/file/47758128368.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/sofenaxelik.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/67494800447.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403e6748531---xepilaj.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jeziserajape.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210913131159.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/36963346705.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/9760268525.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/33113260266.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210913081423.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/varelaf.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_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 10764 bytes
SHA-256: 95ed66f10e608b17a60f8761e86279dec1235c10584660241e4540ab224ac9cc
font_01_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17392 bytes
SHA-256: 9e21ee18a4296212cf9f695b0c8d758687e9e14ea4f57fb85b488aeb9ec050c5