Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec44df0307c47e9c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 21:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 953cf8c52afd400de6b3b3b7a380b06c SHA-1: 93f662f7243b29691663dc3aef4b4dada579212a SHA-256: ec44df0307c47e9c0f1a6013cbe45049be0c993e6dd409c93e5e82b589c3d026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://italy-ex.com/images/blog/file/75494716766.pdf In PDF document text
    • http://weorderfood.com/uploads/files/nokevezakaxinux.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/693342402.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/84681199039.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/84606898851.pdfIn PDF document text
    • https://digireg.org/upload/22100925244.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/jexepilesosolomobus.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/65463315641.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/sonudifezeb.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/12115064865.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903160451577.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/24927901565.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gixusimiruga.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/7942096496.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad5792882---divezefuvabatiridon.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391594aedee---gefazakukujizopa.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/82295024094.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/mogulewajitifiv.pdfIn PDF document text
    • http://fruitvita.com/files/files/lefefuwap.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///tatuvosotaru.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/98612549160.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/019c2ef377764006f7ab86ab1b67e9cc/29166483499.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/44095431350.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/42750389286.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/samajuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+to+android+video+callPDF 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_off0000be3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3D 16328 bytes
SHA-256: 1584c76e83f256480149604e96126a6e5afcc8bbd81437308338c8c5a7b03cbf
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 10244 bytes
SHA-256: 37f32228d4d04da41be3d8e3ff48af73c0ed4ab25c6038562963ded17640b75c
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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