Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac94c915d40ff23…

MALICIOUS

PDF

141.2 KB Created: 2021-07-30 18:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f612c3293df0de5897d2e3e7cfa0bff7 SHA-1: 8cf4eedbb227ffdcc3a23ca4231d09023fe08ed7 SHA-256: fac94c915d40ff23097f010f7abc6f5cd7c70610c35be02ac1933a35de781a51
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristics strongly suggest a phishing or malware distribution lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654da978fb---miwikiwosuluxa.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/24002524959.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1954420565609ca0de48e2f.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e6449a8b767---juvazolorifoxufun.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc8b2765a07---30405373353.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/fimonunamisexu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0c8d7c1cc8c35a6ca1ace07cb22320e7/22496813535.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/kekijetulujamigob.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fcd38bb8---88390060488.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c931dc0a909885e11ab9a4cf60e3ca69/bikimakebu.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/77181125682.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d9663e464904a07085dbc894c4f6abb3/7956897893.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/656fc52d08cbdec9e9031ad792d52432/14083963260.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/gufojegugi.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/75476676619.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/68c5c58921c9a7ae119e977d39a18744/32500184375.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/592d4b2e7008a153932039fbe1e4ba2e/rawuferumiwida.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/o16v864d3q8039p9dtbrvslam1/fubigukigononabiwobu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/ropowegobosobefa.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aa689a4faae8bff0b1dcfed26c085373/lomime.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0688dff458f7fda77716d7c4f6b3ef7c/bisisit.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/77204711495.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c7ea07aec---boxajin.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608461158bdb0---tejuzuwileledew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=amazfit+stratos+2+manuale+italianoPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/nakarozaxutu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A15A 10636 bytes
SHA-256: 32da8aedd9899bb273b465e2b582ebac1b9e163f04cdf61daad4476bfa60bedc
font_02_sfnt_off0001b9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9CA 29252 bytes
SHA-256: c8c0db1f6d4e8b1a1036c53a97b8b3df7588a042fc97d3de25adeb7eb21e0402
font_03_sfnt_off0001fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD09 12672 bytes
SHA-256: b9a56c28b1046481ca89ada2874bffe428c066adc6243d801d2bbf97e94dd442

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