Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e0acc150d4d89…

MALICIOUS

PDF

98.3 KB Created: 2021-07-21 12:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9c8a9c57706a12d87d0eecfa5cef01e SHA-1: 12ec8c1d0e215917a3ee3753e08dfa90f1a87736 SHA-256: 5b9e0acc150d4d89e15cbd18ca5f1c943d69b4ad7cf64fbbb53eb573b9ccfb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2489813c---11805701488.pdf In PDF document text
    • http://verynailscm.com/user_img/file/64619973510.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/pibanatetuvo.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/rajud.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b9f8fd46158af55b331b9996ff97ecc3/38692253112.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
    • https://zold-kommando.hu/files/97488554441.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/25067482124.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/279851073cda442a0ad0df5c0315f4bc/vijekamibexisoz.pdfIn PDF document text
    • http://moristas.com/userfiles/files/69110177015.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69761945e---97248672468.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea7f61b72---28827759914.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8cf510ff99e0b6601dc22c9f29ea9c9/kasekaroronevefazag.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/bidibagejevotimazirese.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hpjc8g05paldvvm6ugd5pne3f3/53148378947.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd316cb941---vunesufuzazutabavekawuf.pdfIn PDF document text
    • https://tisuputih.com/contents//files/pemenozolakudiv.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a35e1fb5l0u5r9opv5bsc8kdgf/33153069105.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f2726d93ad14e9393ac372666e6a3709/33388180374.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb557215---38143176936.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/wakakep.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/1189980122.pdfIn PDF document text
    • https://btegypt.com/file/37075813008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+slithy+tovesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013434.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13434 16420 bytes
SHA-256: caf2651d85cf4d381607f7f2077a736288225e3f3b22d903b72655e7c782c5c7
font_00_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 19812 bytes
SHA-256: 56d0908bfc7cf86c05471e025609d8ac441ea30921dff895a714c2b22f2b1597
font_01_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 2676 bytes
SHA-256: 64db0ea1ef49b7ad4ab2e23ce54afaa3cff43924c1db2e9f2992fc370f940393
font_03_sfnt_off00014ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000162f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F7 9984 bytes
SHA-256: 5f5588885b0cf055055a6bc7ad7db21aed6dab18c066daa070858f4e406db7b8

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