Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefcca498e6cc70d…

MALICIOUS

PDF

154.6 KB Created: 2021-10-13 13:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 513cf81df21f98fd12ac456e9ac0b672 SHA-1: 202c86a28327d0ab75bdc75e7e70cd384e3ebc21 SHA-256: aefcca498e6cc70d5e810b9da2ad3bfde03615f53f00a7478ff7da1806e789da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laptopplus.be/app/webroot/files/userfiles/files/31627420890.pdf In PDF document text
    • http://h04ydivan.ru/userfiles/file/42743417008.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/67741204350.pdfIn PDF document text
    • https://funke.be/data/file/30163507033.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/4088319048.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/lizemebufadejit.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/43182267028.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e9d1797913---benegeruzi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/jezapujodusukag.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/tuzewaxidutupidawux.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/26978260073.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aff839a75a---jililepiwakono.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/loverosugupugipikakakaf.pdfIn PDF document text
    • https://cubic.is/userfiles/file/59450549986.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16160496a27299---vexowarufopujo.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/18672357737.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/65382296473.pdfIn PDF document text
    • http://videlec.be/ressource/file/pomadobepurozinivaliw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d6e50766a---mobolemok.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/rikijovodokifijuje.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u95vjt16nvkc05ft0bht43ssid/14717907748.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=i+am+the+vine+you+are+the+branches+commentaryPDF 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_off0001e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E846 27160 bytes
SHA-256: d94bc0f957f8d139f90c31d0522cdeedb97f656aeece05ae84a650ee7b7438df
font_01_sfnt_off00022afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AFD 10820 bytes
SHA-256: d9e6e03c5a777c1a0d122ce1b08c083ec7d93ec336f4ee660603274dc6d0afd0
font_02_sfnt_off000243d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1