Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca3586f8017b2e9…

MALICIOUS

PDF

76.6 KB Created: 2021-07-25 15:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4328e11303b6009198f1407a53530b7 SHA-1: c192f412816a45f140415141f0d7f277df6c538b SHA-256: 3ca3586f8017b2e9b7144f02480ba3ef4ab74172b5fdd8b3b436a2d0d3ac8cca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://adian.eus/files/galeria/files/tabumelisoxujerisafo.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b889b5c9---juvodatixelobodoxa.pdfIn PDF document text
    • http://drironcat.com/images/file/64306980653.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/bobebe.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/29516766454.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/97714614697.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91ce33a37---gowatelopezimovugatamizir.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jamisudoferezagalubujijaw.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8eea97026---fufofizokusidegemime.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/152527235360c58e1e734b5.pdfIn PDF document text
    • http://aonetreks.com/uploads/file/64553609241.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/39558771861.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/30290215793.pdfIn PDF document text
    • http://paliukenas.lt/i/File/vakuzex.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/14602736653.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/t3b33gvhmblbbmo3la2u8uko1g/27315164433.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072330956107---85647511760.pdfIn PDF document text
    • https://ka-base.no/images_content/file/korofiwirolap.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/25034205018.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/gadufubomidubexaxi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/95e5c904984a1c4f79aa0530128d6e3d/datukafaf.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787cf7189ea---gesumizefefa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088534edc25d---nebozumipebebarumo.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/7b31ce1c041f1467e33525c5a4e91147/75121311655.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160845b1da56b3---90685389957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gali+chirugali+dj+song+chatal+band+remixPDF 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_off0000c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 15924 bytes
SHA-256: 45cba54546a16a469578a047d3d6007098bc3514a4c7bb7a4a259d4b762702b0
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 11328 bytes
SHA-256: 1e599a415ef58f8671807f1865cadb2490257ae85da62a0f8bab8e618110a11c

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