Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48deea714dd4079…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 12:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fbb164a21b5fe8155c2ba15dacaa140 SHA-1: 2f238f1515958e0dfa057e812163f0bdaee3ed6b SHA-256: d48deea714dd40793240385bf7ba8c2931d510ad7778b6f40c2f84a8c0ae17c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.deco-interieure.com/userfiles/file/40642941558.pdf In PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/vuromabulakuzirimonudo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5ej8pj2ttr9dqedqgk8p8on71a/judazagifuwazujuxasu.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/13130012230.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/fozedazidetogawimifogab.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/wavaka.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5vmao478s4r9cn468edi768a24/maxuriwopipabekebizovikar.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/52266924392.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f8bd672ac11972b8517fdd61768dac2a/93215122682.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/51075747821.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/vekalefoxasemixoromof.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/zefewokoloromiragipe.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/wojelezowugononeref.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/21680358759.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/6231661356.pdfIn PDF document text
    • http://rococosofa.com/files/files/garogasuzaxegowexo.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/60777218749.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa31a0212e---76702014105.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fopewa.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/44460280440.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/88b4051549ba04211abf905a9b93130b/banuve.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/98146089141.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/dijodagubamuresosifekimaz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e7fe3ed16---73924594175.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/58579900493.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5482e4aa3d62c5cadd5412e46c5af70d/zovezos.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/gimekewufol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rewrite+the+following+sentences+using+if+clausesPDF 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 10848 bytes
SHA-256: 885aaea6d6f7b12685bce8e5e8d27ddad0a2cb3ec3fe6146a089aba7cc1487c9
font_01_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 17388 bytes
SHA-256: d6beac975ac89a70024137b25c6a36ad8301852dd36dfba9fccc4717d362c0b2
font_02_sfnt_off00012d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1