Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea159641269ff52…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 05:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a98b6bb2a7e07f4ce3a3f6cf9e5082df SHA-1: 2521d282244258ddb9a9bd57318629d382df50e3 SHA-256: 8ea159641269ff5297acc34d98501134f61dd017f21fd1f2318459f1cdcb8845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=metodologi+penelitian+kuantitatif+sugiyono+pdf PDF link annotation
    • https://kit-veron.my/ckfinder/userfiles/files/lapudivujatolazarusovav.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4faae3107---12725139162.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/98e60d7fa39d61a8b3a58f3fd2aef1b2/52794927630.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/bikujalivolikisijavi.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/56554800470.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ab26236d---45615752854.pdfIn PDF document text
    • http://biatlonbreza.sk/editorfiles/files/nasonaboputiwuda.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/lafakakapipegegenexibuz.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/16863131894.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/rofelazeku.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/76247284353.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/getasuji.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/savepipovawera.pdfIn PDF document text
    • http://rsst77.ru/upload/files/39748427880.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/65088831566.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/be2afabe874965768459045a043807e1/kawubinesofu.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/nulavigop.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/73456294937.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5e2dd2ef---roposugarutodajesamaz.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/58199359778.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/95734232572.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3533da5b9---bulagujuwosapujekujose.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e1e6f5a6---13929375335.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/73181549186.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_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 16484 bytes
SHA-256: 9214b4a109177d32a1eadfa527996f291bc14864cd24a6a8770243d827e39275
font_01_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10872 bytes
SHA-256: 8f4488209f24bd6f80201616370c77cd154c4056fbc07ea077588a34a79a407a

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