Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abf94ca319103c6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 04:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f05ddaba6416a687a6fe686648f0816 SHA-1: 0e1830e0dd058f907259e5600e14ba5df805c420 SHA-256: 4abf94ca319103c62a7b088667dcb2292113af34e4a33f8e1affbb06e96c07e5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external links suggests the document's primary purpose is to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://happyfun.tw/uploads/files/202109121930247234.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/dp71000gokiue29q2h9ag5kdcl/64053862018.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/pemereligodepetazukimagi.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/miwiripimiwedawojefodu.pdfIn PDF document text
    • http://fohow77.ru/upload/file/lupekumisewuzanosalusitul.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/45834933677.pdfIn PDF document text
    • https://777mto.org/contents/files/buterujizuwowububekubexo.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/29916374904.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/97237484068.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/42285418656.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109090852147071.pdfIn PDF document text
    • http://nayyaralidada.net/alpha/ckfinder/userfiles/files/67628197944.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/xewelor.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/kuzegikaxoki.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/gumezimujixivememadu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b37aa97d9---kewifozob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a2b14b92---88981463345.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/penawexo.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/buzezevikel.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137479c258d8---zikenesaduxazek.pdfIn PDF document text
    • http://citranco.com/users/files/23260681736.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210909_8E3E9BA45054D4C3.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/napulatimatosozajer.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/wubutotumafedomefopeni.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bm3jtai7g8jpv1lkprdddjvmf9/7195215075.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161343436ee0d2---xavimavalivono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+ver+clave+wifiPDF 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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10336 bytes
SHA-256: 5c2c93e77e4138d6a6b56f238b9defaf829adc3cd10aaee68573b4694d15ceca
font_02_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 19636 bytes
SHA-256: 3ba3aba333ba46c599efe33694dd9dec261132a72310d62a7d1b3ddb5d4b2750

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