Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f034c4f1a5c9d27…

MALICIOUS

PDF

98.5 KB Created: 2021-09-19 03:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8f525b43dd4ebc3b59fb96a0e4ad139 SHA-1: c35059fff10b4eca771f879d2ffa5ac3f5ec46e3 SHA-256: 4f034c4f1a5c9d27cc0e8987794f5de73e1b8ce3ac61b772ecb26fa7ee536d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://elementsgogreen.com/userfiles/file/xaxep.pdf In PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/masumadumezixujusojima.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/netafulofezepaligupemul.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/68822964758.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1025023e1---nuduzuvirivasonipe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d38a5dc3f0625e4b5720140eb3515c77/mumuvomurel.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/35251941207.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907183821.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/90212118787.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/zuwebi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/zemekiweduzerevovezo.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/46961265279.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/dizajunixoduseve.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a693a0c8---61201667550.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1cb4141f---kolojepagivofume.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445e90bd841---bagifixununutepedu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gv91d750cc1okf2050j9jibjan/65222289447.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210914182050907825.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tewabanepasi.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/57326885367.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/33546016044.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/12746141539.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/ribokikavufimagobuvo.pdfIn PDF document text
    • http://someteme.com/archivos/_20210905132153.pdfIn PDF document text
    • http://archbot.pl/files/file/tevuvatubow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+me+you+can+t+see+123moviesPDF 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_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 19748 bytes
SHA-256: 3449ed27daa37b2dd32b640044cea470ade8958fef66e7276b236a7254627943
font_01_sfnt_off00014ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC3 10936 bytes
SHA-256: e6895e53f3930cda9ac52e3d4eb08aaf96424d690dbf5893bb2c23bca0cdfbcf
font_02_sfnt_off00016425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1