Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb5e1478bc526ff…

MALICIOUS

PDF

113.4 KB Created: 2021-07-24 18:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ff3c44b300fd3d3535abb0e305599df SHA-1: d9d60ddd61bc9036304c62e2532e2e780d7ade20 SHA-256: 4bb5e1478bc526ff4f8c612121fd6858c8d8b3a0410c02b63055fdf2850a3ff9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to PDFs hosted on compromised websites, indicating a link farm designed to distribute further malicious content. The presence of a download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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 https://bjjewels.net/nbloom/fckuploads/file/51198994721.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f1afe288f---wurisuxobem.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/dagurokafosum.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e2533bcc0ec3c98919f8a1cbc3d8c827/menusevu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ee08ba05---67936502955.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef2d38bf1ffc4994311fcab73c2286cd/vobisapebedijugasivubomu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/megegutukerigezevixix.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/linux.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/vavugepu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e031b9b5b9404de5a35b3b4a0aafd143/51409872730.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/jabetubiser.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ek8ni1v54lfmcn25o20h3d2n96/27322343140.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pdoag0afn4s4bh1k5h8d7a47ue/zufezupevokufawe.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078effdca00b---22543434087.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4jv0d7d7cajd08t239v0d40vnn/22366418965.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9f84068681062bc9b64b33f5ecdbef3e/disaretedu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ls39nvkk2sofi2quvfs7t19u55/71590403906.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f58b7efae1849226ba48af26932d1a03/kuwurijamibezimexelove.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4864c399c5---22146709743.pdfIn PDF document text
    • http://davcpundri.com/css/file/wetamefosi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/reraxigemivurakid.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/164c7260fcb5bcef81e8c467dc0a9114/95313088770.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/539f915fb2caabcc3cdfafb2283f4285/11599278827.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/21788129302.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/fogixel.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/jiguro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=narnia+2+full+movie+in+hindi+free+download+filmyzillaPDF 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
font_00_sfnt_off00013ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_01_sfnt_off00015514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2B 10876 bytes
SHA-256: b58c1506dd9eb8332763341adc0c50d2ab110eb68b81d621cfedcb6005825fad
font_03_sfnt_off0001862e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1862E 18352 bytes
SHA-256: 9478ad373c4d5df31f294b75671750519367ab603663952b62d0e18411cb07e6