Malicious PDF — malware analysis report

Static analysis result for SHA-256 172b9be6664a96f8…

MALICIOUS

PDF

79.8 KB Created: 2021-08-28 07:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2de5c04608d709f929435d096dca4fc2 SHA-1: bfaab8796ad88c7812d24cec13227308f7021fc7 SHA-256: 172b9be6664a96f8a3a580734125185a74f310f1330b7cf8669211457b35e8be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phishing lures. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://boumqueur-edition.com/upload/fckeditor/file/sosise.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c5637b64---zumojimetuxumagudetatumu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/8781355406.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/be5ad1304939d581b53391f29654e7ac/xavexen.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/jovomifopaw.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6fa2f784783bf28cbe53891ec2c4ff52/5779944594.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/jekuwuzomivurunoz.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e68dbc179af4a1db1a85a6cbfd68ac15/nafoku.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2d011d98---sarekuzizimipuliwiputasa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///99624452010.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/vadevotilujugase.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/namarud.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/23005766637.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/dasosozobagadake.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082671ada3e3---rixumanosur.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kakid.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/kafidubatofepuzelafixala.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b66f75050---sojebewavotaz.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160760bc3b0016---41588577912.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vegazufegorot.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/73353344847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ripspeed+dv740+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000c04b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC04B 17216 bytes
SHA-256: 1ff08b8c61c9c93fe1e6709cafaeaea839c73c1242e3e2d07b761d91d5658a5f
font_01_sfnt_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 15220 bytes
SHA-256: 49e00a236551e32557f924c4b245445a2fa19da8e35a4abb3781982d63af00e2
font_03_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 10696 bytes
SHA-256: 9fb3870839b46c5b89eb9f1bd91600b6c85c431c3617beededde6cc077f71b3f

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