Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efd8dc1ee33ecec…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 20:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7582a04420c9c53a627a08715fa3f41d SHA-1: 10f58f95832d7684d1c9e9effcb85f2fbbb7f5b1 SHA-256: 9efd8dc1ee33ececb91894dc3879574cc7cca68842292a5b3816ae4327ff1296
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links on potentially disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://visit-pune.com/userfiles/file/bigegobipewaz.pdf In PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910080814165197.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/bulaxa.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/70033179093.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/19896344676.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tubiwedezetitak.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/79413406912.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/34631008695.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/kakidib.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/wulonetabevap.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/minax.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/wejunalavamevu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/xutudexekiwazigo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/78175776369.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/mobit.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/47913889222.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/g9qa2cvknb41t55kffp22bf3rh/88950179063.pdfIn PDF document text
    • https://dintek.eu/uploads/file/dudaduzirunizujufukifo.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/cfea0b9656bb348f4d2c093170e62c73/1208745856.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16145c165aea45---vofomegenew.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/53841785602.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/sovutuzaruwovukazup.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424338a852a---mevov.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/jamixitito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stbemu+apk+proPDF 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_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 17920 bytes
SHA-256: 86a287181ae634910efddbe4e33ff397c94c12300bf25387d2001ace7aa31544
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 10408 bytes
SHA-256: 838e753054649077bc1040f43f37aa9e988d119d9298cffbfa50eb0a42596d9b

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