Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8db63a82840fa3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 22:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4abe87aa63f24a0194542f657f265771 SHA-1: f653e6ce219eb8e90cadc96ee38fc46412627740 SHA-256: 0f8db63a82840fa33fe8e0c401861fe9209bbcebf0a11cdce6a249892ca41af9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to host malicious content or phishing pages. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being flagged as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/zofirorisirafetebugux.pdf In PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/zutezib.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/4305463179.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/tutadawabenuwexudof.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135115a49125---13471617087.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5b0794ebea45ddfe5fcd677abb30d3df/43037032213.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210912232212.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/86814280930.pdfIn PDF document text
    • https://rais.bg/uploads/file/5311722551.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/mukobilipadedinokowaxukun.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/vobesi.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/85153120155.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/77882559384.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a929c0e95---majexugurovujasi.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/gezokemagafalexuzije.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/50053659448.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/75526258267.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/96456481959.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/vuxafo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134234bd0711---98557459841.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nexiduruzuvos.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/13635015722.pdfIn PDF document text
    • http://foodchemsino.com/d/files/54233610438.pdfIn PDF document text
    • https://derfo.info/resimler/files/80539038822.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/57570709785.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376141995bf---30200408170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+vs+ios+testPDF 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_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 10080 bytes
SHA-256: 75764eaff6cfc83a8f8422dc72c2e35960d11b2caced1835e9814485d7ddf62c
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 17968 bytes
SHA-256: 03f3c76c01f22906d877e3651d8eb6bfb4c63adc5bbc757422c7c12ef723bab3

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