Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d682aa8bed0724…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 11:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0507bb31f72f2bcc5e90848e0ba506e SHA-1: 65577be260eb0d966650550ad22637e2442697e3 SHA-256: 66d682aa8bed072414b45db6c6f03eecb231889442dd71db17b6927f174aa4f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=johaar+movie+online PDF link annotation
    • https://stealthwindow.tw/uploads/files/202109111901096058.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/vugedamugavox.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/47580457863.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/76312147920.pdfIn PDF document text
    • http://nessium.net/userfiles/file/68199715611.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0760c1bdb0484dbbd2adc049202d6b87/72382428668.pdfIn PDF document text
    • http://iscelenie.info/files/file/33283860964.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/walumiw.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/sunadinufijajotuvemed.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fp10asloe6lpujc62vce16gpq2/tudejurided.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/zefopasiner.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109151054392993.pdfIn PDF document text
    • https://123natura.com/stockages/files/zojaxotibalib.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/76203290667.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/46203528984.pdfIn PDF document text
    • http://e-sportis.com/images/upload/60315432100.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/wifowekagixisudufo.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/zepamawo.pdfIn PDF document text
    • https://tierlistei.ch/downloads/95181173092.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a896ca253---jagifajafozot.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/jipusazilaxi.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tevizerotifip.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_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 17228 bytes
SHA-256: 776450d000968f7f0031c12cb8fc953d4cac3470cfcf91d7170a739bc42e15ae
font_02_sfnt_off000143b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 10164 bytes
SHA-256: 3f8ae55d718af5823c3f190c79cfe99dd80f0142164ee21e682b9e1022557a9d