Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6432933e3707ec…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 08:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f50e573b7c30bd487c8f446cea760d35 SHA-1: 31627275d8b83ad281c39d0149f1555e2dcc3af2 SHA-256: ac6432933e3707ecebb6c2f87b9c9ae2334adf1a9705ff90f37a88971783650a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed1ada54e---wurevimedewupufopifuzewo.pdf In PDF document text
    • https://riwg.in/userfiles/file/buvawevojofirekarozugo.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/17908316562.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/10222309998.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fe1b9ad20c91a85968f88ff834c34ea9/lawud.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109110758087328.pdfIn PDF document text
    • https://ebooksweb.net/files/file/679744002.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/71376248482.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/nijidobajegonuzolofuna.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/titom.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/noxusenuvesini.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/purinipiwajunidugexej.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/lulepip.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16136509247132---70753284087.pdfPDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e34eaa7b71d726eaa642a5cdcb7d6981/bixirebetewoxagiz.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/77882552004.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6443aad5184c62475edeb6b876726684/31599662061.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139c314b22c0---77002502857.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130effc419e8---49110961650.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/puguxoridivofejudorewajan.pdfIn PDF document text
    • http://hk-keber.de/images/file/66464163446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hd+cinema+movies+apkPDF 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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 10580 bytes
SHA-256: 89d90af72637cc4c44eb7d1e3425f802e5bbd3ffbf14567759350220fd34067a
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16136 bytes
SHA-256: 72c44f7f238ea603bf9c979833c4a1eac1e2a0bb54cf079aa0f9496a5acef0d2

Open this report in the interactive analyzer, or submit your own file for analysis.