Malicious PDF — malware analysis report

Static analysis result for SHA-256 701935003b3f88df…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 20:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ef78db0427953ada6915aa899d96921 SHA-1: 9333be177c8f26d7646c90d70f3b2c2274b43da4 SHA-256: 701935003b3f88df561d2357a5a26bc0bbfe7efc397069c33fdffb8c3cac48a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised or disposable hosting. These URLs form a link farm, a common technique to obscure malicious destinations and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dspec-car.com/js/upload/files/13733542401.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/5349456681.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/82938615685.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bda4fa7199---7127120370.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/zipopigiwinipubukugaf.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/21420370407.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160984630684d6---jebexugilub.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/47167724136.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gll4ubp955lnphhh57f6aa2bs7/84296997896.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/59472294819.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/1816091849.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/55731459185.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/73244873101.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160819c940cc1a---68227208576.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b717323a2cd4774925618d76480d8340/49521516718.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/kivinuwujutexesaweritagud.pdfIn PDF document text
    • https://people11people.com/uploads/File/wubogadidinur.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/43244580979.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lenuvekamesexunaxuj.pdfIn PDF document text
    • http://sooclose.eu/upload/File/96568671898.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/94404019654.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sujapuxepeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cbse+board+class+11+biology+book+pdfPDF 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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 18992 bytes
SHA-256: c202b87273f7e3ae7edc4471e830f6373626ee3654f2b18568067cd13b8ada6c
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 11020 bytes
SHA-256: d8f5a7cfbda90cad7b6d0274d88e3709d93cf926528f305797e5e9fa2c37b7b2

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