Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fedc1f27f71b051…

MALICIOUS

PDF

120.7 KB Created: 2021-08-03 01:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba0f1c474161e6dfddca02120e9c950c SHA-1: d0c260b4b646bfed307163753fea30665c5e5f23 SHA-256: 1fedc1f27f71b051a5d712cc715a6a5407fdc238deea2440ff845904f60a6bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results for malicious purposes. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trungtinjsc.vn/upload/FCK/file/53806180349.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/scso5i23m7tim14lkkvbn2ei02/duruxazota.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/gebinozekozox.pdfIn PDF document text
    • http://megalaserasia.com/upload///kifurukubiraledaziz.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/velafoji.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f618551bd---rozatebanodiguf.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/wojukar.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kidimoxaw.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/53795427753.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bfa55a3e9---84974611047.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/gisogoxeruwawab.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/24790359831.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1a96fe3e---rodatisuzonugedoro.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e035d0d8f4---45595674818.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/55838188862.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/11307906544.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde485b5dd---nakojovasenisake.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fifetuwowokijoxulu.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/welabuxow.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/retifiwubam.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/nebemere.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/nuxaribam.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/62651974354.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/01af88edd63d9ff336e6706c81c0dfa6/66899518891.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/7909872759.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082108e2ba05---98110725769.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/69640821350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nato+phonetic+alphabet+english+pdfPDF 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_off00016d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18577 22200 bytes
SHA-256: 6e3de6c789ad3c47cfcd9c364601e168faee677bae611c938aa44cb7740603bc
font_02_sfnt_off0001bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC4F 10916 bytes
SHA-256: 4d145021ff6e24d8ae6e6dea95ec9bb8e65145932833f36bd5b3f809aede0553

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