Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fc82f16dc1d4f0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a03f59ca717d0261f86e439500b5d1b0 SHA-1: be27c1f256b74a61de31f5c0e6f4738194709786 SHA-256: 11fc82f16dc1d4f059f3a16f9f7876a16f4072c4e04f84aecb84c0ebb47c4833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs suggest a lure for users to download applications or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=asphalt+8+mod+apk+unlimited+money+and+token PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9bfcd642e---xosarabudupotowi.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/67665073948.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/6057611443.pdfIn PDF document text
    • http://grotech.in/userfiles/file/lalomimafidi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133657a2eb59---buvafeminifedetadovubav.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/mujaxubigo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17601129493.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/gaxabekogidufojujebi.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/42959715763.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/71352966553.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/48838162782.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/zikuxik.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/fitozufalaw.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/24383255323.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bujemerogezumeseli.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/69703436444.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/47300827975.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210907_071722.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/karudopefevadunuxagoj.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/4146889559.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464f859614---66323565486.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/bowene.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/baxinikilezapofezomolep.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6e2d975406cda8dba041b8b7cdfc8400/29991533002.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5dab94c1---sokopuwewowabodaxugerepiw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a731bb8fa---pepisakokenetadubeba.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/24638691549.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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 17736 bytes
SHA-256: 26f4900770cdee68d9003a0c40cf6fde45d5703060221ca5fdb169d7a9d8bff9
font_02_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 11052 bytes
SHA-256: ce97599133d1c670624c375ea1829b8b22c4785b979b5f9a8fd1a462b86984ee

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