Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15b219245e55473…

MALICIOUS

PDF

97.3 KB Created: 2021-06-29 17:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2324a50defb5c36841a773c9a14b1694 SHA-1: aeafa27bfe126ae5c2bba03739d3b7a4794fbc56 SHA-256: b15b219245e55473a9b5939b319502d11f53990db03c58e8cd324e059fa738da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malicious redirection scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://infrive.ru/uplcv?utm_term=bootstrap+grid+template+html PDF link annotation
    • http://colescastle.com/clients/875019/File/16322294592.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/92246216551.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075318adb278---15958229302.pdfIn PDF document text
    • https://activepymes.com/pub/file/54397329769.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a933de3f09---56108118801.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aff279b756745d92ce01822630a00929/kokedesodosufufefun.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/lapupogomavaguxikaxaru.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/81870850030.pdfIn PDF document text
    • http://muszempilla.com/files/file/86290554962.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mm7t63oj3cfkqjjvce8auao35b/sodobimigot.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767aeb0fb6d---29627074432.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/a0qj9uhov61qmg05ngg0mknfhl/xovugixizo.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/28605649456.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/64631916128.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ac1aaac6---13701950553.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e33991a---raworirerokaduvur.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c81af6e52295d14dd83162d8954050fb/foloxedebetow.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/31005267596.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d20c3c2ce---76905828288.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8d34913c---54302849860.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pubutazezilatukefuduguso.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/wofatakoro.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c9e902c3---nimitu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/ganabowogedovufajumer.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210519174310.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 17760 bytes
SHA-256: 1080fe42f78726f335c5ba93a7d53906e068c385319803b1b8cf02994f5bdab8
font_02_sfnt_off00015f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4C 10788 bytes
SHA-256: 399f69f2208dbf13870c013661bb9159e102fd512ced0a0cd0be99ff341b436c

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