Malicious PDF — malware analysis report

Static analysis result for SHA-256 489b1ffd06cee24f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c62c4bf6633264a3ec0a343e9dd58895 SHA-1: 1d60a2a5d6b7b2b5aae65aedcee5eab4e99c376d SHA-256: 489b1ffd06cee24f02fcf052d60146e621ad9bced9b73110173c9b5887870214
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://northwestconvention.cz/data/files/19709180871.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d0a081b1eaa0476af951f2cd1e2df43c/54653668878.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad7d204af---46391394127.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16120dec38ed96---fokagufuletomagi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/52qhe4re4l1sifbqgd0p807tuq/zetatilemavapeg.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89041114157.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a90ab3d48---gavijelurawozupedibibalo.pdfIn PDF document text
    • http://taociren.com/upload/file/210809035316156251gij80fvtsrg7.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91d56a79e---jidigejadanajoka.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/54497864436.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/zeferomafabel.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/91548229974.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/55744885981.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9f1faefa6e4146ed01d4b67924f28b3d/86282215178.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/nivobujujatanosug.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755e7b3630f---30992597124.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/48147478926.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e059276046---76501453472.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/damunuligulisopubisa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acb29d20ae9---7727713892.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c63f2e7297ed82b526ed04fa91d20229/fimasuludoruvujamof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+meaning+of+appearancePDF 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_off0000c1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EF 19228 bytes
SHA-256: 984b9fbfbf4d4ded68d5c1edd2e40adf007f666997c019953c46fc9a13a288e2
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10576 bytes
SHA-256: 4af922660048ee193704e2f62b9b9d65b4747dad1c8bc1d141f7f00a4a90441b
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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