Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c68a7d3821d5a2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 04:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbc011aa18ddc6d8c6f269ebd51b0da1 SHA-1: d9e2bf4c6436ba14ba9f349b9633e7a593dd4a04 SHA-256: 89c68a7d3821d5a2cad015020886e880fa67af81f84c76fe210226e4682a0386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=pentair+400+pool+heater+manual PDF link annotation
    • https://www.sterlingsez.com/ckfinder/userfiles/files/laperusafusuveraxemuzuxe.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/35029817401.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0aao6cveuhngeks5nl15dhhet0/legarobeveza.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf90b6715f6---donububifofavodexafivoge.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/8257624510.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/af1d8f0f2d789c201acd4bceb4348d49/molexefirevesilon.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/97096396521.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/lefetefuz.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb2e6d8e5---pafub.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b7b1e973---zujetajixorotabo.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/fuwogekimozipefo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42a132c15---karenumeji.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/5894269518.pdfIn PDF document text
    • https://alutat.com/data/file/19995257638.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/7767528021.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/navadesib.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/51430609111.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/lavafofiburugepoxufedoz.pdfIn PDF document text
    • https://t2sc.me/userfiles/daboxifowujoxomed.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/minofegagulotil.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e26016af459d664569f7422e1f6aa5de/jukulowafewediwi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d61b94210---rapaxewozolunuz.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/05/file/20210605_114623_154.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_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 18560 bytes
SHA-256: b20e693cd8d6dc29402df2550f76ccb1cc42512679f97be58e14a329c174e715
font_02_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 10648 bytes
SHA-256: 94bcf3ab7f5831fb76c2278cbc7685e7ec9006c3c2be66fec773ec77415183eb