Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1db823554b8844…

MALICIOUS

PDF

68.4 KB Created: 2021-09-02 09:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21fc882a738ce2e1ad8c84979f61a3d6 SHA-1: 1efa0d1dbcbc51b6e5d2e93bf2ffea771daa9c83 SHA-256: 3f1db823554b8844246f9bbe529df36972f15940b9807427201930960c67aeb3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dlzj.net/upload/files/20210613172645134564.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b329dfddf54---48508695075.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/mirujano.pdfIn PDF document text
    • http://hangquangauto.com/files/67734702626.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/bapixexomubib.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/sunakagamejet.pdfIn PDF document text
    • https://dineflon.com//files/4696547412.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/17184703869.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/53020309086.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/68603792198.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kekuravojegexaxo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d468e88cf---wevejebopa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b339df2fa45---gobodojudumolimexetiv.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/bumutudadotetesolusobif.pdfIn PDF document text
    • https://blokhol.com/upload/files/lajenu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/gbq53q5qjgmup7gf6ct3umer71/71005015337.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/beduram.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/19116082514.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/26807995987.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e3f6101f20ee2b32dbdf19d4314db25e/nesibuxisasipomoduv.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/90951432367.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/83e39e40a0059cf2f3136d0cb4ed369c/vakotegegedetogug.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/tuwesudinumanasawe.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/74676843803.pdfIn PDF document text
    • https://norservis.info/files/files/bipodivevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=find+out+xPDF 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_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 9812 bytes
SHA-256: c2c6b0ec01e08058c7b4e6df149fb8ae88663df0c65c89dfd4f6f82e40c96541
font_01_sfnt_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 14252 bytes
SHA-256: 41bd023780a8ced65e570f43df40271d042198d093bdda4934a62924cca1709b
font_02_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.