Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a758afeea33cd0f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 12:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9ef215b262f5dc09f1ff271475ecf03a SHA-1: a2c142addf79283eca41acdc16d1b43a4a6d9b80 SHA-256: 8a758afeea33cd0f95ad752dfc87bf69e30f302376831b448624e8bb266c17a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The presence of these links suggests 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-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://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc6fe0812a---30282079051.pdf In PDF document text
    • http://getsolarny.com/userfiles/file/lodifekanav.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a4011313fefeba410e5b608bbb0f1e23/mimiluriresefakexepodexi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607285d83daad---74650276644.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/56163190379.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/54251311316.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/78973581514.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/munage.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/43183292692.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/55484854260.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/29817628868.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/bamogevulemejuzitafojow.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/tirimifotavizazok.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/tulumugil.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/gapukowu.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/butinuxebeb.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mkpllue3ragcm486j57hunfu16/xivetijavodatalema.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/47144415737.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/58510050327.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/85596915971.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/navexagumuxofukaledepeb.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7bd0478d2---13889639090.pdfIn PDF document text
    • http://santabruna.cl/upload/file/43954199398.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/142302248071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=excelvan+barcode+scanner+user+manualPDF 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_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 15612 bytes
SHA-256: ad233ecc43ef4bcbe011e2f6d9269b39ef5b20fca655fe67d270d46038636584
font_02_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10732 bytes
SHA-256: 95920f9d562ab80bf908179e9090d9e14adb492e8f9162ed422e1b2aca79aba6

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