Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afc345982ca1318…

MALICIOUS

PDF

74.7 KB Created: 2021-10-02 00:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb4aa13645e90a30ce1485866bd266b8 SHA-1: 1954988992a326beb50a401c97c9ddfa30c75d7f SHA-256: 0afc345982ca13180569ea9dc58601fd392017b337774020aae3296b6c4949ea
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 by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress upload storage and disposable hosting. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://burbank.kopanramen.com/uploads/files/4855003039.pdf
    • https://telechips.com/ckfinder/userfiles/files/4972944737.pdf
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/51079288981.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/zajisozuvokaxuwitix.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/dovadoxogilubepeso.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/vurubamulog.pdf
    • https://appchecar.com/ckfinder/userfiles/files/44529242915.pdf
    • http://jrpst.pl/userfiles/file/2953312571.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/podamikifexowejotaru.pdf
    • http://yanartextil.com/firma/files/16691471525.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_6257E20AA9A13F22.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/famujep.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/86cd95045a2ab8bd982ed451c00a144f/tezubigetolano.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/1676437216.pdf
    • https://kawanmto.net/contents/files/77649034597.pdf
    • http://lyzph.com/userfiles/file/Fl202109141550094004.pdf
    • http://elitacasa.it/images/file/pukupofigavo.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/midiwimugapuxomu.pdf
    • http://alrabbancapital.com/file/files/81696230630.pdf
    • http://serdceprirody.ru/userfiles/file/migududonuxatefenokeb.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents/files/bejebozujiboju.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1768636bvpqv6jhs61b4d4f7m7/jupomawalerasifap.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6f696b9d27bcfb09cc2f4d41f1566138/90830537288.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=excel+office+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d5.bin
0ce223e7742e735f76fb90a915c9119ff188109f9de2afc19ea11aa8d08cf05e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 20108 bytes
font_01_sfnt_off0000ee73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
font_02_sfnt_off0001068a.bin
858ec0afd6b8e43f7414827a4fbb81d049cca1c01308cc589e26a3fe5c781142
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 10180 bytes