Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93f52fe7713a2de…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 09:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ab5da711cce90e5bd22e385191649a5 SHA-1: f4b1ba94a1123080eb630ffc6ca11e17bded3f60 SHA-256: a93f52fe7713a2de1580944bcdb8e608c406583169feb0493e3d7d5630cbd73f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=best+smartphone+under+25000+in+nepal+2021
    • http://cavusofis.com/images_upload/files/toguwavubog.pdf
    • http://azinsaghf.com/cache/fck_files/file/lurutesisuzubuwujuzikem.pdf
    • http://a-xian-coat.com/uploads/files/202109110910247481.pdf
    • http://dkmmotor.com/files/userfiles/file/sijegepaluk.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tugibofomiwefixumarowaki.pdf
    • http://unionnutritech.com/upload/files/zosevi.pdf
    • http://ausafe.net/images/art/files/11146786792.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009e86b080---puriwomorekibu.pdf
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/lisosivilezajoberamikoj.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614077a992191---mizasikirej.pdf
    • https://next-engineering.com/userfiles/files/xibesumibatebuvuzerowad.pdf
    • http://szentdorottyapatika.hu/files/vuzewezibimagevotibuzal.pdf
    • https://clubesolbra.com/uploads/files/pazejomewewadagepifamome.pdf
    • http://wixoon.hu/upload/file/51156974375.pdf
    • http://proallprint.com/userfiles/files/gevetakoxavele.pdf
    • http://kartelabasligi.com/images_upload/files/43702598794.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaac85a668---kinekuwokefuxupamijopoxo.pdf
    • https://nasikampung.info/contents/files/29557846310.pdf
    • https://godahoian.com/app/webroot/upload/files/wisupirojivosewa.pdf
    • https://curtain.jinware.com/upload/files/40091298930.pdf
    • https://vienhung.com/webroot/img/files/fedaz.pdf
    • http://stellarp.com/userfiles/files/873383984.pdf
    • http://focalthai.com/file_media/file_image/file/febosepipukuzunimajebakur.pdf
    • http://1hozain.ru/files/userfiles/files/desasibogekopimo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67f.bin
f4a50be6b8cfca2d455f260317bde3afc1a267ba892aa72e079d8d98f2c30c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 16816 bytes
font_01_sfnt_off0001021d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16792 bytes
font_02_sfnt_off00011a34.bin
63950416f09f9a731f1adcff64fbb2d4cc0a3bb5be2c03bb0f63ddfcf848f095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 11236 bytes

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