Malicious PDF — malware analysis report

Static analysis result for SHA-256 756cc4bda7a7ec5a…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 16:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ee2bfc14b9b459a75916f259d710371 SHA-1: ff81dc9fd1118ee851f622e8796a2c9a38a2c772 SHA-256: 756cc4bda7a7ec5ac7bf718e7d438e7ac8278e6768c05a49bead49c1b1932c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One URL, 'https://wastran.ru/uplcv?utm_term=super+tank+mod+apk', appears to be a lure for potentially unwanted software. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=super+tank+mod+apk PDF link annotation
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/mezabaxinizatewaji.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/bemukuk.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210927151358.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///vizolodadufokiwowa.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/36921337024.pdfIn PDF document text
    • http://csp.hu/editor_up/80470164138.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210910170835_pfj8x9.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/43212924497.pdfIn PDF document text
    • https://primer-spb.ru/files/files/vamusofatorufaroxelubuw.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nisopazijegiximuvinabugu.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/senanasubanuwunirem.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/xuriwugefokudi.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/96625530171.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/rexom.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/wufufirijaninevo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/komijikuvobamedezaluwod.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/33513814134.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/fesetixisolo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161332485abdff---39401345853.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbd8284ef---82468193978.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/vilefoxolurumigexibidikug.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/gamipinefutun.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/53933147736.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/22468537050.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b4c95683---15685687121.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zuwenosep.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_off0000b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB292 10516 bytes
SHA-256: 5d4dae8f933ea2c30de9ced56fae894d1b6f75842230b6d9c48e94f34acfb98d
font_01_sfnt_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 15304 bytes
SHA-256: 9a7398a1db572d6bbd3c261c5db2dda02c50f40dd03bc69c0f66d726bcee82d4

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