Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a454e9af5ac412…

MALICIOUS

PDF

100.1 KB Created: 2021-06-16 04:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8a99d334f05f15f26efe24b405903ee5 SHA-1: fbda64ff579a6c5446a98431c2929d99395bcf20 SHA-256: 55a454e9af5ac412bfc4f0bae76b7a6103cb90f58816c646a53670ccbac93754
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/uplcv?utm_term=streaming+film+semi+sub+indo PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf722fbbc---84463092853.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/12588736252.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/zibasakedukatezavuranavi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8214e58b3---nazizavevuga.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65010bfd8e98dcdba75ec75525304389/vorudumureriw.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967be482a67---toxudededoxelapitanutuxu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/48963072b0740c1a9ae50c5bf46ffcb1/37429122089.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e35091a7a6cfe19d0428b43205ecac7b/mujelawupemikolidubiwu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/93478039338.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/58389241093.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/sifejudanefo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/92652c7ed10d1220e361eb61b742a310/60485476686.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba649c6bfa---rewuzojuvozutop.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210601074352339.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/sugatetanuxozowuroxu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/10831745929.pdfIn PDF document text
    • http://mamam.by/upload/File/file/pewufogozo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6e6b8b17---pejufazivida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 22444 bytes
SHA-256: 10e6dc9ef113173101b82921a7b27b90e90442a72a8ab8c8f091c7afa5525f50
font_01_sfnt_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 5468 bytes
SHA-256: 66436c06c7dd4f4ea50b37e7bd41bc5c7334d38131013497cbc7f13f6881d54c
font_02_sfnt_off000145c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C7 11916 bytes
SHA-256: 8191a3f9ae36403e6da97a4046e6405fb32b941d10799817b932cc27a744e50b
font_03_sfnt_off00016db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB2 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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