Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b36f281a82c1ae7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 02:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e2b4cd87a045c07525e6c5dd798003c SHA-1: 61917ced47c0c28088c6de020abe1d8b76289a8c SHA-256: 8b36f281a82c1ae7de050b5344ce48e28bcfba171986dfbcbcbf968fc988e8fd
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a link farm designed to distribute malware. The presence of a visual download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gekuropimakedurexukomuka.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/27732117591.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1a5cddd7fc214095fab708ca0ffeb832/sokuremosigozasoviro.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/senawino.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/23844282184.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109081102481183.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/23597727968.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lgg2losh3qurmht8bvmqgi6d65/pulolukujanezutofak.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bepivixoluf.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/73011abbba663b70df5ecc51a370829f/torolegepuripi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bnnkvvs2ugkl8cc6mue8nu0cp6/nawiweziwisawejajuguvi.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/59149473540.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e19e4b18766cda03bdcabcf8c2d68b8c/rovumamunukimimo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4e39de31530a5b7beefd9e0b7fd6602d/64052390921.pdfIn PDF document text
    • https://krusomying.com/data/file/43857347343.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/netowikisumabojipexerod.pdfIn PDF document text
    • http://myphamasia.net/upload/files/golifekawokimelovoki.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908025229166097.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/lupefalajonamagaxipipumal.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sanedesatusoxalilivifo.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/72934984592.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/5528440727.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dumil.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/voroxovaj.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/3755667470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apk+tv+animePDF 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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 18964 bytes
SHA-256: 20d0943f252b3d53a18a9be3ba726fdb21912db467a8eba28efa61b269faad6e
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 10120 bytes
SHA-256: b52d90042a8a4d078616319590aa1ba59d8a5a39ef9b0037ef9104faa6e1d820

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