Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b21ac4bbe848135…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 03:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52f4d44ec7450381c3d0595100e3e37f SHA-1: 6b52ee61d3e9ae117f50c32f46dae493eef4f3f1 SHA-256: 9b21ac4bbe848135570f3fa0da3fccb5259edf061b0edeedb7b91715bb3d865c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://toppelletmachine.com/d/files/79869028432.pdf In PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pubepelaweduzezejikot.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109131710494913.pdfIn PDF document text
    • https://tomas-music.com/contents/files/noxobuzijogidevamelew.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/69236677666.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/85612267783.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/56070148767.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/68329212773.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/mafovedulativivake.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/96b15b6686434265fa15fa7dc13e9782/boderutigipisajulovexixeg.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/wepulesi.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/94073202282.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/fekavepunudum.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6befad8d58f08a00c7ef42de46ac3963/81704913787.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5da13ab62---72770126416.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa59a1621---mevinabo.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/91074421504.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/setizude.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/delog.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/texamegazupenunaterisufon.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/58175456907.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/vojugirimokojexex.pdfIn PDF document text
    • http://shesob.com/file/files/38844791543.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asterix+comics+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_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 18960 bytes
SHA-256: b394196ef02a15f2a3d502c140d128fce0ac1cf7860805d7fbac14935d4fb106
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 10700 bytes
SHA-256: ba276034666ed84d7baad620e9c11473ff3e184c1976a84cba3d36300b7af6d3

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