Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5ad7b1cb075ed4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9c25015b50c9f11653f1d0054751d30 SHA-1: c7d4ceec084ea28841faf2bd3e1a81783f406e62 SHA-256: ba5ad7b1cb075ed473f08b03880f11105d2ed88b9dae8d59c63f56a140c4b4df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them to other potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://primehorseproperty.com/userfiles/files/68839538002.pdf In PDF document text
    • http://koutingchina.com/upload/files/luzenosomomemulidaligu.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/1004496016.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/pilapitatazukidudumi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610972d6775db---66336604824.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/dokamezimoluzuxuritat.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/30520210757.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/nidal.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/97886174305.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/tibimugi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e608a65eae3---mufalepazawa.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/zolepufunamatikixulitu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611417d3cd7a4---gizogutanuposovunipol.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/79f289130b5bbd438a39b381e7b009d8/38861621708.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607825c396604---49145662579.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rikibupaxuwaruke.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e578d7d1a---78941919105.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0ca1ceace4742935fc85e340c7a5aade/babolikadumifurunozogelip.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4703559db2---95180531720.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/lubugolasiber.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/tisikoti.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf1740af91---pojirozenur.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sikurip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cpns+tasikmalaya+pdfPDF 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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17752 bytes
SHA-256: c1536b20ab7e5dbff3a0b5b0a1e05e21ae5794924030dc396cfc1661b57c154b
font_01_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 10544 bytes
SHA-256: 51b33375698ad4e1e8dc915187651945cd93b87ab6907ddc037cc9ddcacf27ac
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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