Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b826fb88e037d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 23:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 93b5e240e16ad1181259f0cac0998358 SHA-1: 2182f5e620a0c096fd62f1d1e07534367fe43521 SHA-256: d19b826fb88e037d45ecae5334b1facd1aac40b6a7bedb5e63070929d7e9505b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users into downloading further malicious content, likely via a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607de74998171---58779206917.pdf In PDF document text
    • https://clearpatth.com/userfiles/file/xilosikiwoduzap.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/mumamaninewajobuvelujar.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e382b63a83---22119448700.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/roxizux.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6mb8a9sa3uj9v3cgduvimcriuh/dezej.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6b5e69d9968b8f3296e23c48ea1fa861/5581108036.pdfIn PDF document text
    • http://orthopediedelft.eu/files/pawadawuzesugivonigetuben.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xopuvofilopuzomirulusus.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k4dbbppdlq7o8e2dfradfg1ti4/giwasexavogejupotux.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1b321f97a5259f9bf14cdd7fd91a98d4/lobefudilexejovun.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0n6cp5let0df818gj8tvqlonrk/robikazinivagiduxibos.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161154193ee687---rosakulunisuso.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1dda067442598c1ac2848a81f6c8636d/88177712766.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/93576912864.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd3a7508ea---fegawututasedalumaxarat.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/sidemugumabanusebumezu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7d63ad4c---63940296387.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/13175394856.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/dadonelosuzutedoze.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16108d50f16158---70940901364.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/32575929794.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/27184525432.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/678821b2eea8b1e0562d73f3155fdcd8/20310265499.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/getivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=handwriting+worksheet+fontPDF 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_off0000c447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 10756 bytes
SHA-256: a505fa1abf591dbdd920bd210ab56a0d989787e95acef527cc627f03a1b3aeb4
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 17672 bytes
SHA-256: bb4ae4d823347a1f9a27b8d25e720c66e277e7deb615434428fcb2617115d14d
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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