Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ed410fd8d36375…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 02:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d995d8be7b59d59d1566edcda0a54b2d SHA-1: 969149c6af45b70de67b02130bab73dcbab2f275 SHA-256: 10ed410fd8d36375eb81f553525813e089a99fa2866e861d5e92c65d015035ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=elgi+air+compressor+pdf PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c68f3906b8762d720d3fb01ad4ada980/61121387220.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/nokedidobi.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/fizodinalelubenor.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/suroxijegezesozenosub.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/wufuk.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4b76727a---fewugidaranaliwidinogabok.pdfIn PDF document text
    • http://metallpress.ru/files/41181226867.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3659940197039ec9490da2011c31ce6f/joxupifamunakafeki.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fdeb27ce8529030695c8d6c4abf621e9/pidemimojuvunid.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf649935e---66205865176.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/saxigo.pdfIn PDF document text
    • http://chineseclothingonline.net/File/fidimovotaxudekoguz.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f206cd8a00---fuzubasovi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210610143344.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d9fe77ee---38604394350.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pabojuboxi.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/sovaxesubizezukezurisemod.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c97fea963e14ce27c916115af98edc4e/9751241998.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-26/20210626082203932886.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/h4f0at9ujgbgbhjcmmei82dhi0/34604016866.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/50979898064.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/25614338289.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/80100689629ede727d902434452e6135/52271745759.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/95537281789.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/43387099581.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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 17020 bytes
SHA-256: cafb73eef290e7e2d4f734019e0a484e0abf4f420ad5a407ba41778a4d026a69
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10744 bytes
SHA-256: 1fed1ea71dad07660fffb8d91b174e4d82f0de255b00b835a3c2682cefe1497a
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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