Malicious PDF — malware analysis report

Static analysis result for SHA-256 29aca51a9bd8e0b8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 13:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7871cee490056efb1f5acf6cacaf97c7 SHA-1: a6b2f94a857659cd15cfb3798051d49e4a0a9a37 SHA-256: 29aca51a9bd8e0b811ff8a1b696cb705439d50ba3c52c1c3dd779a90601fe341
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 upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shopcode.ru/uploads/file/sidevawekadafadajopoxibuf.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309ab94911c.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904184742.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b111979b---vejefugatugijapedere.pdfIn PDF document text
    • https://forssh.com/userfiles/file/tonevagatozepesavunatezos.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_1FC65938B23C53A1.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31939233136.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178cbc07ec---rarulufon.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/40861960253.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/riwijiwokesuxewefenome.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/44984174620.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/gudoxadibej.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/19647596025.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded935de08---velunelugabaderana.pdfIn PDF document text
    • http://lactopad.com/uploads/files/92666692591.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/melapokoforak.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/mojoxadugosaxezunusaz.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54c7a22d8---lamekekugufenomaxanud.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/burebuzop.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/25628412815.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/bumekanazepavaz.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/livukelunufavaj.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/venezoniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=john+gba+lite+mod+apkPDF 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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 10792 bytes
SHA-256: 4c856e4fecd413de28e52932b7ea702f9ea30c08c2149f5dce8278961aa6457b
font_01_sfnt_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 17728 bytes
SHA-256: 8ac6f03d7a249196a88bf3a924ffb9847f319a6faf2e1ce01dbd7fd8ce57b602

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