Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04c8250d36e2233…

MALICIOUS

PDF

83.9 KB Created: 2021-08-25 04:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 570298bbe4cdbb15e3eb2fe9a130cebd SHA-1: 278ea17c368acc68ef7bd6cb47322a9d5db338fe SHA-256: a04c8250d36e2233a92f8d495c5886b98e3e4235dddf6e4a19690c98b7665c07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/957821863583afcd65d311025605ae2d/22655562198.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/57648541576.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/wasegodidufitinudivegab.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4f372202156b2da2923228ec8cc552cd/68806716811.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/65013650e841b9058807331140d8c2c1/juroka.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/dusubis.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/89610303850.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a8mdmsrtm5kgn0opaknh0drr53/39950430046.pdfIn PDF document text
    • http://ladna.pl/user_images/file/lujobusujewasemoxe.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/jexilodezufodeb.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc00d61abb---vikebuf.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e26f89f8e2---xogokekusotixopis.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/sininokosej.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160772ce285950---38979339487.pdfIn PDF document text
    • http://novichiha.ru/pic/file/2038269529.pdfIn PDF document text
    • http://tavio.su/files/file/1374698515.pdfIn PDF document text
    • https://olterus.com/contents/files/68793150107.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/85468134324.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/7f804ed1f2819d180774c6ac9668e4d6/mexujutirebibeneka.pdfIn PDF document text
    • http://kechengchem.com/upload/files/25507468282.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/29376219522.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/sodurovabapuxewexujawazug.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/tugave.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/zuxilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=real+cricket+20+mod+apk+all+unlocked+downloadPDF 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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16576 bytes
SHA-256: 54c72edeb50a498a92a5822cc2afb7948500201c28bdf9b4ffd0e542e36f7858
font_01_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 11072 bytes
SHA-256: f1fba9a48dcfe0cffe0ae9d0107359c529fb7894760f07ed65ad94ca14ccef53