Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2127aa757e00f2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 03:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d981cde22b14462a8e6651b17276227b SHA-1: 67b11e37e18f6da54dce281c5dbcc21a825ffe31 SHA-256: 5a2127aa757e00f2773290c269878c5a20757de1bbd680cc18a2c086a5b48a94
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and embedded links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vom-ragnaroek.de/uploads/file/64983114257.pdf In PDF document text
    • https://www.ruchya.com.tw/upload/files/48622546599.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/fosuguxukenulazojafer.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gc1bh3brjm398r40913p6trinl/madudol.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/50183521805.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/57499927526.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/44249494010.pdfIn PDF document text
    • http://usmleworkout.com/files/file/sezusejivapejijupimuzor.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/fodeko.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/72895079449.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609873f7c2215---14692436571.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3432ff0c44b93584caa3f00bd30a7b18/felukizofudimakuzunodetif.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607223f624e5f---bubevumabok.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609329a092083---jejop.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/gixudipujilipepisizapuf.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/ditulebodakisaxa.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/vozeliposavabiwivobun.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/vozunexokok.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/vixumagamorifakenomamago.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a927f8029d1---ginaposizejoloxotepudel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af7000f76---62864438031.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/jutazukuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+earn+money+fast+in+need+for+speed+rivalsPDF 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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 10916 bytes
SHA-256: ce218821014987d6285e4504cfc9cf099c8266b3a906c0830a1f3df8b4baeac9
font_01_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16980 bytes
SHA-256: 1af934d7ad456c2eb7b2ef66a555057d688db5e96c23a1d540b6bc9bb8bc8ad1

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