Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb7696a77ed00c2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 08:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6bbde23973a9d3404063dc837e8a9875 SHA-1: d9c3e0a8edd8272adb261e088a6e364a5a77eb70 SHA-256: 4eb7696a77ed00c2ed527079d26e92321c758e3e503617a86a5d177e38e5adf9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://windowsplusllc.com/ckfinder/userfiles/files/31696976645.pdf In PDF document text
    • https://buyafranchise.org/files/files/59194172779.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/2841726293.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/jipokoxadunimibinor.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wivexubosaz.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pusafigamu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d590d960083d58259b053eb3b286bf84/lafebuno.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/50587999871.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/pezusorokizubuzoru.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/gowopegotoxenusesipipu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/14353182028.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedef2cbb8---89747972047.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/dalazewo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c60d562dc1---16533304107.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a2a5d9cd48d5aedd4284fa39d1df43f0/givawinovixewaxomoxem.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/37666183148.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/gepuzi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98403c603---91447160702.pdfIn PDF document text
    • http://sswjeans.com/files/jigudebab.pdfIn PDF document text
    • http://chromoink.com/updates/file/nujolomejuni.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/20200692139.pdfIn PDF document text
    • http://www.toptehnik.si/images/94937890647.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c3dd7030f380886e8ab701010160ac82/repakumogebopemuk.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615136c051318---4990927172.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/pejujipewebexixikupas.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/62408007465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chromecast+built+in+android+tv+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_off0000b96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 17772 bytes
SHA-256: 8f3226eb93be4a32f22a55fc45d2c195d22ed58364aafb3afbaab144134824e0
font_02_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 11208 bytes
SHA-256: 546b43ea3b438960dab15d584a7ea1a7d89ba36a0201c16d68b0e2357a81ff01

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