Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6674463e2df9b5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 21:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5949588177c36af602d112660ff2d4cc SHA-1: 459d40114e5e3ec27e9955c883e5a1335aa96b27 SHA-256: aa6674463e2df9b5b2d35ae2e0a774ac2069eba2996de1aabe49744ff0e874e3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs are structured as a link farm, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b726263e7f1---47983456563.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/99832550468.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16103dad2e6971---sagituzajotopewafubazete.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864fa4b9d1f---kavamuv.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tazutisuzin.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/pamezokowaxorufoxaromamep.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/pujufexebugakajejatalilat.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dfef609ad---65202236431.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a15ae1ae3---49125112695.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/lizititanovutidex.pdfIn PDF document text
    • https://penal-garazh.ru/files/ledokaju.pdfIn PDF document text
    • http://bio86.fr/fichiers/rewat.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jitikobebebojejiz.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/73764752467.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/66475399259.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/wogavubifuse.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/dogejugidaduxitifuxizigo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15d82483464539182313e377f0c8d37f/gexasixexa.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jawogovu.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/sigazowemepekuvafubebulo.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/88496888334.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d573d25abe---65106342068.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835a20662d1---vabidanisikojuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=all+about+me+worksheet+for+adults+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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10964 bytes
SHA-256: b66250a0f35e4ebff22d2d5a7cad92d9c5004b6414c253031e05b02ed947a127
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 17932 bytes
SHA-256: 3e429e93eb9fd3a9c75236eb4b199af5ec3149863c25fc018f1187f7c73ceb25

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