Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ddaec167fddf66…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 04:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b0abdf08524c08cf52b3b72a1de4aa5 SHA-1: 7affd11fb5b51926ece3090ef621cfd3356eb6b0 SHA-256: 86ddaec167fddf6643fe544435b1d4f3538399b471c670239acace71f843c2e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://derma-dts.de/files/file/58272303245.pdf In PDF document text
    • http://lev-steklo.ru/userfiles/file/vidobu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/72fb352b0424fa9500f1d5cf92b21b60/betifiruwax.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/22250871678.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa08b64a02---85144514967.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7f770f2be36c5ee7b66b11cbf14660b4/98104098058.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/45325103645.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/nisegazirotunupajafoj.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b85fc04a54f3945061225f21ddd24623/nilejuburezam.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16119c2733d845---45244205752.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27430dde5---tazafuvakutarodo.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/furujo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38b48abcc---53675207557.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/3k9i8ijvfh81t6g6t9bs2f17hg/nagimulerozetir.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9124aa2faea5061335d801fa7c706265/bilevagopokefedo.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/fichiers/nesodajevetisojubi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/eh9hkfepe2h3i5jqqo1btps631/11040229149.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/993076ab12dcc3d84299ee2e1258e5a3/10818677673.pdfIn PDF document text
    • https://semut73.com/contents//files/goganugujomidodawikubine.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fuvowenumezesanirogoguna.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097496fedf9a---gifikegusujuxesotawedo.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/pugonusuxelas.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040506028147.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gjjdoj396pc21crkkgip7q53j1/36578683336.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/34850675344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=griffith+4th+edition+solution+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_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 10648 bytes
SHA-256: f7b1c8ae6cd7f06665c133edd0550381b5e4e8c93aab5447ab931946d4c9e98b
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 16920 bytes
SHA-256: 168636e797e8f18c2dde19395eaa67b53a4a38444a7825a304da8d0a1c635a70