Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a6abc711135b39…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 04:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93e0ba0f1a58294b039560c3fac79172 SHA-1: a7c35f27f6de4d0b16540a65b786a93f61a02dc1 SHA-256: 17a6abc711135b39fd61e63bb6e6d52e2f2a03619b963944b286343692f0db09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yasacompany.com/upload/files/bariwimopibegiboka.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/24477387196.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905161719.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c823f024---83984851797.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/90013277447.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/39990611375.pdfIn PDF document text
    • http://moneymaker-gold.de/files/98940964877.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/53959079032.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135211d02a2b---buluzamakuwepexe.pdfIn PDF document text
    • http://ptogel2.com/contents/files/44502250697.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc77edbc9---20119680419.pdfIn PDF document text
    • http://ssp.by/var/upload/88067922756.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/43102523497.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/pexapezaxapedi.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61541827326.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/76383173483.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/13348058506.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/pugososowazojali.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/petesujerovozofetit.pdfIn PDF document text
    • https://moolans.com/uploads/files/39750952587.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1601888e7---30184506851.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/bemibitomefijitudidogulew.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/72564151032.pdfIn PDF document text
    • http://hbaoge.com/upload/files/jurofupadafowow.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/matanepirede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hd+streamz+install+apkPDF 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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 16576 bytes
SHA-256: 6919c71b59a15cb3326963e371c85111f5c93acc0071f8e6c84f49a1cb2af934
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 10576 bytes
SHA-256: 158b6b4ada14df1fe7eb76c0e812dc6262f6a0695193c93b065c154526bc4857

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