Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf665823aa0715a6…

MALICIOUS

PDF

94.1 KB Created: 2021-07-31 04:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b41c3970f294ceae50e2ad52f078559 SHA-1: 2eae6129a65f13b1f3aa5ebc40d3bb876996918c SHA-256: bf665823aa0715a6857dfe1dd991bcd8e0316eb874a6f8ddccd85ce1e3fa758d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm strategy points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://candybeauty.vn/upload/files/7342961435.pdf In PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/26172509708.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/88459474632.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/84996734961.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb86afb1---suzibajilolufejixiwif.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/89d33ce0740686590ab1569c6c79390f/44433548223.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3317da74770a14d972396a31ac635717/lopevupavarun.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/690mpuvqeu5kv3g5ufe62ssnhs/43413859506.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/43152210224.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78674a187---wutamoxofofogixin.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/silanikakejonofuzake.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0139949850ee8f056169a004d037dc48/15382575276.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/44874543641.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/35211722958.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4a7f50266edbccd1d206725ffbccd716/91397758542.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/iva2qkqldv9o9cqhutsgcaql3j/wakawamuxonijisukijut.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad28d60ef---fuzekifufanaluxarabiv.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/mifuxokojedidokefex.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c5daea36173b09d72a80bb9b91723be5/tuvanefofumojitana.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/widilusigodisiwuwenajep.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/bakipumiwinodofi.pdfIn PDF document text
    • http://usagimatur.com/files/others/solipubulokevaj.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/66425352886.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/41838383343.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/91641480356.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866dfed230e---13143050695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=marcy+mathworks+algebra+book+a+answer+keyPDF 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_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 17608 bytes
SHA-256: 554f25535b0bf347d6a0e5ced3caa23ba29a830fbdc48c63853b658cc13d0ea2
font_01_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 11008 bytes
SHA-256: b2b45f7fc1c02ddb13f4f3e4a338729fa7c731753781315632d598c741688b48
font_02_sfnt_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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