Malicious PDF — malware analysis report

Static analysis result for SHA-256 809921140fac5709…

MALICIOUS

PDF

94.9 KB Created: 2021-09-20 00:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a46039d4d5163897907abcd96c8c7ab SHA-1: 76250e29dacf8518db4f8f4f1f78e33f2cf67600 SHA-256: 809921140fac5709ddc04bd0b621734287f2a043efc4603525783b0897d39b5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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://drafthe.ru/uplcv?utm_term=game+space+apk+redmi+9a PDF link annotation
    • https://ndmoyun.com/calisma2/files/uploads/jusodebajubopexoma.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/77722088683.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/22153008574.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/63036767072.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/51308703550.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccf7046f0---62720126656.pdfIn PDF document text
    • http://feminella.ro/upload/fck/joruxidel.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf2dd75fa---55625426484.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/birural.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/45637932312.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/rosivusidajeruzirisidu.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/49820145787.pdfIn PDF document text
    • http://julianina.dk/upload/file/pokekolelunik.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/14261488525.pdfIn PDF document text
    • http://schokozentrale.de/idata/37756698334.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/31960188065.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613126c882d5b---fopusamemasi.pdfIn PDF document text
    • https://stormester.no/files/file/91382994737.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jemitopulimuxerov.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/95793928845.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/kixuzoledalib.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/gujadinumenapubapowijaw.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/73119661834.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/16595142778.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pusajawowegufu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/32765136261.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612f521d2ea50---28033633625.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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 2076 bytes
SHA-256: 3cc8a62c510cf61b6e0b78164b43afbfa54ec56cb882c6a341d2014e17d809fb
font_01_sfnt_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 10608 bytes
SHA-256: 75c7b09b804496b8951c2eaf6f9f78d7d95b2af321c475a6d24a78bcf2a3a24d
font_02_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 24608 bytes
SHA-256: 149a3177b9b7f2dcc2c3ffaa745c3066995df1d48b8efd5c01ee01499d609d46
font_03_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 16592 bytes
SHA-256: 0a5b3553f29add41946b193dfa63bda31ff8a25d0555484284ef8b7a6938cc09
font_04_sfnt_off00015525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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