Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13597d85d62b247…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d678251e300f4f3126cc2fd520ea85ca SHA-1: 9e950f80e9760a620cf4bb417dae34f9832c8247 SHA-256: d13597d85d62b2473caa5ae469805a3cbb808ed7f88cfdb34f6d17787dccf9f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, many of which are likely compromised or disposable, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://camberwelltaxi.com/survey/userfiles/files/finagi.pdf In PDF document text
    • http://standardamulet.com/files/files/49031646390.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/ruwago.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/62217468268.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/wajipofepuvipemug.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/ramupevojipuwijefonivejoz.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rebigo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613680a81971b---29944320830.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4010877cddbccb6381c5597b9fdf568d/vagog.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/32940676342.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/82148034690.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vatenixazesutawugazika.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8922dd0e7---33679655444.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/jerabidowez.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c185447fd31da1f5f0da7959d6b11041/23447034495.pdfIn PDF document text
    • http://www.moyekolodin.com/files/wesolumutepixikadisejup.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/20654128559.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/54495527611.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/1567004826.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/segudunavatigosi.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/nedudusemitosabomivijag.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/vupoza.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/38099489075.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/96783789791.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/lotefatizot.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/42485966997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+itunes+unlock+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10480 bytes
SHA-256: 95ed5bb20c68fec332f6c151b0d4ef7904360dd6a2cec7907305514487e92b95
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 17228 bytes
SHA-256: 94e7209930c942868d8b7d09daac5721bd22751aa1b62241425b1eaa89848069
font_02_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16836 bytes
SHA-256: ee2afb669f07d84736ee05358e089d5a078721ce99fe8200e6a754284eff3586

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