Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1397ff596e1305…

MALICIOUS

PDF

70.7 KB Created: 2021-06-18 17:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9c02dd404e7e2c435b7dcf39e8d49200 SHA-1: f010eb95a0f9d958f1fbbd13f3f76393e4aba201 SHA-256: 5f1397ff596e1305e64f8c007ef6aa93c1f686ba148df3b19bc72b149138be72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of these links and the overall detection strongly suggest the PDF is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://inwebjor.ru/uplcv?utm_term=dawn+awakening+apk+obb PDF link annotation
    • http://massimomoroni.it/userfiles/files/nepujarato.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/faditijolejamakalunawi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9f757e0b8cc12077653bf588f5af07f5/lesitibidakovo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/95539pm8v9orqpvdad3kd0un45/93246598210.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/qiev6fhonuv603q7rsir2lstp6/parupuwox.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/tuwikizofumakoj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ruxuvivi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3dede5738ad2cd9423c2af3c769e60a2/bozufovemoxobefofabaja.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1e25316059fd414307552ad11772e0eb/87081938983.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/521193565159b3c1b7be0ead5b4c405b/begedadawemon.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/jumalugap.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/28803274850.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xevadokogatapup.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ecng5evls9jh6g0g6dghlo2al1/42725274103.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3a274691---43650615912.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xaxekowosuloxutovi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wuwidonakuxufuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC916 3624 bytes
SHA-256: 6a22fae08203a493e86b2bf8d8fc9f1b748d637d915021dd3f4e7919f40babdc
font_01_sfnt_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 4976 bytes
SHA-256: d5c5a6479da62f635616bb92038fe216297c15afe8aebdb089779bca47c0ae01
font_02_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 10920 bytes
SHA-256: 2653d83b3f66e6041db41d66845078ae8f46a842d83f9f82781723eddfae7e9f