Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a61f04f9cac6dee…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 04:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c39713bc88b15f6a03cfa375effc1a22 SHA-1: ac3b233fafbb4f6646d4c427cd5d1c1662b452bb SHA-256: 4a61f04f9cac6deebba1f174af7888de78b671c493f5d5cfee8a7751b73c1bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yangs-ns.com/ckfinder/userfiles/files/20210619110207.pdf In PDF document text
    • http://kadh.kr/bobod/upload/file/69808799392.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/85772059628.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/89506686613.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/99613221179.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/27959253687.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c46f4e0---38613992327.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24f242e76---2086052246.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/49908427539.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/647bfa52c5ce19b5e56d2f2cf71ca4db/33850034287.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a76bd0aae35bc097e0dbfbb712944acf/16916886001.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2ab7b55ab08a224c9ca718aaa8d71293/temazuwid.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/kupajufipuzigemoxaperifa.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/92466407469.pdfIn PDF document text
    • http://teifsepahan.com/files/file/9711390341.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7917e7c6177fab5a60b4002bac651881/kupude.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizabizudizonuraxiwije.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/robat.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9f044ebad336c41f9b13724d14e9abaf/87112961555.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/42b4866e77beeb154819f9f21ecb1a5a/47518728186.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ba7cs3oj7d9bjec5i6cc0n6fvm/85189828086.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/joramirufiguwaxufamazap.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/kidapozoxesujuzumiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=yealink+t46s+admin+manualPDF 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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10612 bytes
SHA-256: c4e5b9e2da94e68ce6b5708896f1f53bcc3d201b3410c53fedf699d0a833e9a6
font_01_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 18024 bytes
SHA-256: 51e1a14911fec37f4ad5982845ee1a2af22392ed026dcab7017b38e5df5a786c
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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