Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fc8de9243b2a5c…

MALICIOUS

PDF

104.6 KB Created: 2021-09-18 02:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f1e84c464eebbd469164433f28d4a66 SHA-1: f40b2e78445a0f3bac8009bb30c27b6c67e483dd SHA-256: 16fc8de9243b2a5c7259ce4c259d9521a32ff95212c754ae9de1aaab91517626
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites that are either compromised or hosted on disposable domains, indicating a link farm designed to lure users to potentially malicious content. 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 indicative of a malicious document, possibly exploiting PDF vulnerabilities or serving as a lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 https://infrive.ru/uplcv?utm_term=2+examples+of+operating+system PDF link annotation
    • http://ninda.vn/userfiles/files/28121032028.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/dazulosa.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nozuzasufalodogefune.pdfIn PDF document text
    • https://istanajp2.com/contents/files/46894885813.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/wutigozalalebipanoxam.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344680b7e81---foketulexekubelozepaj.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/22085145236.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/jibujakenamutilagetumoron.pdfIn PDF document text
    • https://km2804.com/ckupload/files/birojogex.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/32385814551.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/xixewov.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/jugitipalozadizasud.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/022113426498.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/98440807772.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/66733803556.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/11658979274.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed360e0886---vabonuvonu.pdfIn PDF document text
    • http://jsdarvin.com/files/4930679187.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448ec532af7---wufowimovavonara.pdfIn PDF document text
    • http://njchemland.com/upload/files/jukobivoganujakisuzawotub.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca03977a0e---88262549190.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/jolamax.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/52734184782.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74028988533.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/lejavow.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/40430453026.pdfIn 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://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_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 10940 bytes
SHA-256: 71899ceec87cf3b2b4195d20ca7d31750a4e17ded69e25f0d8ad9247ba5288b5
font_01_sfnt_off00014c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C61 18556 bytes
SHA-256: 645804c47a02a188572d386a15c56bab40b68a822ef7fd15758f18e0e1c87c21
font_02_sfnt_off00017c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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