Malicious PDF — malware analysis report

Static analysis result for SHA-256 c064bc3a184f68d7…

MALICIOUS

PDF

84.7 KB Created: 2021-08-17 18:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ac7c5784dfd166e33386ea144d26020 SHA-1: c9f140fc5a2e5e67b5950372a23940226d5a95ee SHA-256: c064bc3a184f68d781614f3fdeb671a3f87d6a0fbcfb48254a1173669751d10f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://odontoflash.eu/userfiles/files/48888665121.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea3920ddf3c30fc1bfb6df5ed93bf7ea/72890823977.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/saxewovezaleto.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/gofijipifoxetelodanexuf.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kofudogogorawekunoto.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0edb65396---87231617083.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/13201621941.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fdrna1tja9qeqtcm09hpa3g83/zajeforifixogutazu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b83a547a---fobemimof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704d041e83---78801866981.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd4a759fb---24801183441.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/17262263928.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5c89b7106fbbf6bde3cd58879cac5e05/90461885946.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/39153503009.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ena0eqk0c2rh2ivrmabd0p7q1h/goduzudaw.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818da761faa---lojevuruzovegizedon.pdfIn PDF document text
    • http://tavio.su/files/file/rojuzimoxebekiwotu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16110e73c40201---37685516166.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0611cc38df---fudakivinafenenidavezaru.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052204491259.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210722234428960609nly69b39lkg3.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/widamefimebopeteponer.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-19/20210519070058716863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=root+android+lollipop+apk+without+pcPDF 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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 10632 bytes
SHA-256: 7588484e8ec3b72fcbad960d8ab5dd679fd0119deef96f6ad0efd5ba9f067c9e
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 17260 bytes
SHA-256: 30d6941eaad7907c9252f7efe4617374fb352d7242494dd3ad5b15fe9a906d61

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