Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ce86abb0c5b107…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 00:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f70b9dcc112d108761de0f89466e4bed SHA-1: 0d6af5f5c09960afd8c830b4481efa55da7d565c SHA-256: d2ce86abb0c5b1079baa000a251603450a93eb3bbb2ce8d7d7ef0169905eb851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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=launcher+apk+nova PDF link annotation
    • https://heks-tech.com/app/webroot/userfiles/files/40336017610.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/74954038415.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161388163bd2fb---47075750924.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/8550413196.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/kavaza.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/puselus.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/moxekasowu.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/rogatoromunuba.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/lasojirodilekedazivivet.pdfIn PDF document text
    • http://artediapharma.com/upload/files/bimopuwidosixuzenijilares.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/fepomudotufujigamus.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/42ae1322c65ad8e71ababb01da7ba216/22989079847.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/9549208416133fe1232851.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/bixuvewixafelukanob.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/sogawesowenukirufiduti.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/43351946717.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/23554444754.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8eac6b4996b7ed69df3ca4b9cc07f14d/vekutoju.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/492972.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/fixifenikiretemif.pdfIn PDF document text
    • https://mytopics.it/uploads/file/bomeregexigit.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924a497597---38418746963.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///53920920408.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 16324 bytes
SHA-256: e02f7a2c62afe0e867be0da5a6f2f525b9ab3943161d924a42da68a9fbd817a8
font_03_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 21864 bytes
SHA-256: e5b1a53453d5058240447c901094bdbe170a55465a8a03aa6a044b924e456fdf
font_04_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 10284 bytes
SHA-256: f11155ecf1964097f4e1c0ec29e7018d54b852292d9b55e9d513f27548076e6f

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