Malicious PDF — malware analysis report

Static analysis result for SHA-256 680d8f278ae2b5f5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 02:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55b71353708d9d62e89c8b25d6b738c6 SHA-1: 7f59b7134a1d56ad4d23ce09a1dfe556fe36fab2 SHA-256: 680d8f278ae2b5f5cab952efb115eac5c0036e159fb7c914b0895fd819422ec8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cbbb0d8fcce5c5c903eb5dcc63763d6b/zasodabemubejozoxezuraji.pdf In PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/senubineme.pdfIn PDF document text
    • http://elskenecologie.nl/files/nuzarokimejupiwetij.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/33bf9ad034bd571d003ba06998c32fb2/98636653268.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/68220701763.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/98183586693.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/goxuvuxarumaroku.pdfIn PDF document text
    • http://gro-felix.si/uploads/gidexesomu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/6313462347.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/641bfd182a86efe8811ddbbd019f2088/4204241208.pdfIn PDF document text
    • http://prmakeup.com/Image/files/17097701471.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021972245449327.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/varadufixivi.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/tidiximonawevuzeke.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7050fba9---4124319472.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/57723439682.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tilitilebeladudan.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dosonufu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kisipiderapobonit.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/81dvkemn3uuto2phkss4v9ce4k/jewaxenoruzenupufanin.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/patobaxubikonazesumebate.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df031aa25---30798741473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=modded+car+racing+gamesPDF link annotation
    • 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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 10564 bytes
SHA-256: 10211dfc373b27fd1ceafa53918fe2d5be20f51c9a80ff03a660bc14785d4c73
font_02_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 18200 bytes
SHA-256: 85d6cee1bdae7b7dc0f4529d959a0464aeb4be384334f6f59b274b6007fba9e5

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