Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba75d8f33ed57271…

MALICIOUS

PDF

76.4 KB Created: 2021-09-27 09:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 169dc83e7014a76c99ab9aa014d04d56 SHA-1: 751e5809e616c4c5bcea3c699fe0de82296ff1f0 SHA-256: ba75d8f33ed5727125e0df3ae5db51dd334064984b5828dad18e8418f6e8c611
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. These URLs form a link farm designed to redirect users to other PDF files, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=furniture+mod+for+mcpe+apk PDF link annotation
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/07a6c8984a60bbcc0ce39bab9c77caf3/32832968705.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/viganifamoxarajuzirud.pdfPDF link annotation
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/dc037e272e2a86640a4b15161fd98f43/revedugomebajefebepev.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/pisamaxewis.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/16765459098.pdfIn PDF document text
    • http://airmon.hu/images/files/85977433671.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148593a4a600---moperotaj.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/fuzobeleven.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/54875141500.pdfIn PDF document text
    • https://swiz.eu/files/editor/tiruvakeweworine.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/zetopigurizipegezase.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902003349.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/wekozewezazunigaz.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/8424748064.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c40858d8c---bofisekebuveji.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/kotonede.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/1729392703.pdfIn PDF document text
    • http://leton.pl/userfiles/file/wifunotikiwov.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210917174609.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/79040642018.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zirumipuzuwo.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109140514431065.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/27731907137.pdfIn PDF document text
    • http://capableapp.com/uploads/files/rajebiwejuverojupususew.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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 19180 bytes
SHA-256: ad94de229c8766422a8609f88e7dc00be752835daed9bc14b701ad8e440978ef
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 10736 bytes
SHA-256: 194b6bdb78ae11b82d9d747ccb04451661613e8b96ab449c89b5e9c2e379bd9f