Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d4dd5ce97299dc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 14:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9e9a97366131964476747aa6981ec37 SHA-1: 02de7ee14909ff1ada1acce177dc9e1dbb776354 SHA-256: 61d4dd5ce97299dcc67ac112a5ebfa3d48b8bf8b7252b907ea6fc183af1f0ddb
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be hosting or redirecting to downloadable files. Heuristics indicate this is a link farm on disposable hosting, and one URL specifically mentions 'apk download', suggesting a lure for potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=naruto+senki+battle+of+ninja+v4+apk+download PDF link annotation
    • http://compsult.net/userfiles/file/22880360716.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/9979359618.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/55834661659.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/38731318003.pdfIn PDF document text
    • https://pixel.bg/img/file/96910125750.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/fupowopobizelo.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/zexodusodakurelopuvom.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p1a1omlv4onbfb3g8fk4c3s0qo/tukororipebudesu.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219822385853.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347ce21c01f---6680967222.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/powelojexa.pdfIn PDF document text
    • http://360global.ca/userfiles/file/89873195621.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/jufijuwirebamotefifubu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3793a95f---66263812110.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903141412.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/73622010530.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/megoladeligemuvuveva.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/wuwanilam.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613591a4656d3---jenufebakamofi.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/47112690500.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f919df4c0---41929884875.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vipelupazozo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/fawaxetalanisimatekap.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_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 17184 bytes
SHA-256: 954bc997f918f991202290f862b187673d7d5d4ebfd9c630824411f1dbf0ca49
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 11160 bytes
SHA-256: e595cb09217d9144a306313127d622ee6279d69bd4c5a0ef5ff82250f0e204bc

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