Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b461f655036bbb6…

MALICIOUS

PDF

87.2 KB Created: 2021-07-18 04:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3bc6030a267626cdddfae273b38030e SHA-1: 67ecf39e3887a6603570c77d741264de17560298 SHA-256: 4b461f655036bbb65b6c1b4193a959b7a0176b42be3576cd87efb2a9d5332b5b
96 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised CMS uploads and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious. The document body is heavily obfuscated and does not provide clear instructions, but the link farm structure strongly suggests malicious intent, likely for SEO spam or to serve as a landing page for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://adabaskimerkezi.com/upload/file/gawunajawaxepizese.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b67cf74b---xizokixazuda.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b1f191eeb---63920192085.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/zererada.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/18046570820.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/bumisugodaj.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/tepotewumuxatevipegobuna.pdfIn PDF document text
    • http://net-marketing.hu/images/files/38526330944.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/vixofu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/sagugerigu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k2ep31cpka8m0bpngc2svuipt4/52747545851.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/73578232.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8fb017b32949c686299ca17934300c3/tanipimesoditire.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/zileguwotezozuzelotufute.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3818d743e---birosirolusafamufezufefe.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/kimozapube.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/woludigexadozuro.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a527c1e0e110b2d0aee3099d293557b8/19679293110.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/aca9ed847092c2a7992e4c64223f7d91/67612795944.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/385653001.pdfIn PDF document text
    • http://pabrikangka.com/contents//files/79233600213.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d5b5dd82---xokolepinubaleponul.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6a76b8e1---41195223369.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/pevow.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ce9c3a002789ab8ef287a7ecf469ac5f/gegixuz.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/a97c7bad231f248173ae8994500c5d1b/33195947264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+saxophone+is+a+double+reedPDF 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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10696 bytes
SHA-256: 580315dbe07c187459f44dd9a96b9427318b5045d31790d87c740fc73ce2916d
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 17708 bytes
SHA-256: 982be7ffd3cc6cd161274e4e9ba0a4ce1f3af18a2187101b2fef82d706072b4a

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