Malicious PDF — malware analysis report

Static analysis result for SHA-256 d878291910b01b2c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 21:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2208733fc4ad56a7e1148728877782a8 SHA-1: 0b9068c72818713b79c1151df484aa1f6fcf964b SHA-256: d878291910b01b2cbc4ef7c8ab1b769f6f688e39bbea26c7f9846d088fc48a3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with common techniques for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=intro+to+communication+skills+pdf PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b772916233---38429728152.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/lebuj.pdfIn PDF document text
    • https://tomas-music.com/contents//files/27175611634.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a97f682425---domedivimozijovum.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/eaf43e7dbf27b4daa9f2ab2a03620be4/72591689571.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/27481644173.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/37963622197.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/zexomokevoganafewumon.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/87c5ec5a6d5485e4b4e2b7bc42472969/87543574531.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/6aa476a183cae3a9d8d0c1f5df321111/6928158242.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c15cda051bb---mokolapojagokijugulobaz.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/savojoradil.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e046f058a2---79988521995.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18c3a3b078---3588972177.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/39247217534.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/cb73153508778ec927425ef5784e3bd2/vekexejidibajajoveta.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/juzukafumukutumepulupop.pdfIn PDF document text
    • http://maxbrio.kr/files/files/22306294708.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/zenev.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dipexajekamegis.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2af672fd---venenifebupinizomepot.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/47048777909.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rrmbd655kb2o84r16t29788n4d/winadibewuwukezojafosu.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/delulokororizik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17428 bytes
SHA-256: 0d5e954f58fd116b2e729553b87d5e4286db72c6ec133b5c2167a75a9455aa35
font_01_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C4 10792 bytes
SHA-256: 9c0034646d4e64af2ff24882cfef66206915cfab634edee2746a6f50e7babbad

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