Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ef2a1cde06719c…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 03:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc68b6b807f2db5696b54231858367ef SHA-1: 0b0ed354d46656d9ec7b4c75d9549846f5cbb4e8 SHA-256: 50ef2a1cde06719c24b3b483123cea3965a2815f97e93c7407924afe58824327
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://princeworldwide.com/multimedia/userfiles/file/mataxuwutesedewor.pdf
    • http://madmojo.com/fckupload/file/62648901455.pdf
    • https://bistakalikotenetwork.com/userfiles/file/puvebado.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f0b04daa23e8a0a055958f8f6640f3da/visozezadelikaj.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597ac4efad---nedoxenulasij.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nolajomarokidux.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e03e236a5d211f97fc1fa575bc918a15/12331807510.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/18400568446.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d119424d8---mudumigowika.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23879e976---bagezajamisik.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e258dbfdd0---xemitasorodox.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/cfb9bbf4f60678f4f6ba6f20e461719c/8324760118.pdf
    • https://digireg.org/upload/rizupokilidoxibebigufo.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/zolumus.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e05d5800---demerabujuzum.pdf
    • http://www.siposferenc.hu/html/12771029390.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b157348e0---xudewefezupifipizazex.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6b5d0d47bc4991db808e7d5c686ca941/60122413297.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/61ka4lgp6a80pkjan62b6bqe11/dijezova.pdf
    • http://prmakeup.com/Image/files/4631464259.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/19297655462.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e265087820---munukifedanewi.pdf
    • http://jatyn.cn/upfiles/202105/file/1620432543.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b94c71a1---lawibibozabore.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=budgeted+income+statement+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin
e9afdf36e072ad208802dbb559957ab152de1e8622f60c49ba43d751c7bfeade
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 17768 bytes
font_01_sfnt_off00011702.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 16792 bytes
font_02_sfnt_off00012f19.bin
99fe8070fab56c98166e10cf92463f7af2f8fd8e79588e6798c0066907480fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 10908 bytes