Malicious PDF — malware analysis report

Static analysis result for SHA-256 6204531b7959bd87…

MALICIOUS

PDF

89.0 KB Created: 2021-07-14 10:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74d2be1f277586bde03f43e849c767ca SHA-1: acba11e9856ac8d05f1bd84b0d10d86d5777cd95 SHA-256: 6204531b7959bd87bdb1b6c5f0fad121028dce7c65529f89670fd52c0526a2f6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest a lure for software downloads, likely a pretext for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alpha-th.com/userfiles/file/60775639677.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mewatogefewa.pdfIn PDF document text
    • https://coil.hk/upload/files/kufogipefejojisefil.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160781b0243d99---19204391529.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/68437183704.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/4262380411.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a942930bbb---lunevuzoxivebugizulusu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522191314656.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/falizofijul.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6015aaad9d---sozurawaburorup.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/74796791702.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49e4c14eb---66618217562.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gutawogufelirejako.pdfIn PDF document text
    • http://ymmicro.com/files/files/dijadunum.pdfIn PDF document text
    • http://e-district.org/userfiles/file/40125055443.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3461971a0c---jemikisobefireduxejipus.pdfIn PDF document text
    • https://iohrp.org/f_files/files/mujedudovedetewuduzilenav.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/uiieb0ee0vs1outv3257oncs8n/85347207396.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc55641023---biruzibalet.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/wopewizudezovapadow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=smadav+2020+free+download+for+pc+with+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_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 11392 bytes
SHA-256: e1c0ae45fd8e929ba3bedf3c4b50791173903049e7953182acabcf4210e55607
font_02_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 17548 bytes
SHA-256: 6809b19e3d114db3e4c8bcf5337f8fd9384a4b8ed1378f1ec9739bcd47389768