Malicious PDF — malware analysis report

Static analysis result for SHA-256 06aa92e43c895675…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 06:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64d804834b8e00df7d3e455c7888fd1a SHA-1: 6afb076c0df806afd9f71f4a95832019557d283f SHA-256: 06aa92e43c895675f32d72864587683e0ed5ffda9bc55c97614e46731b5e4ef8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maytinhdalat.vn/images/uploads/files/jamodabugetilin.pdf In PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuzuxigawevinovukapifimu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/74157854384.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/1755085033.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/71984033454.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613221b5437f7---fozegajobezomizirofom.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/98681934550.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1621bc7a---junivuvonije.pdfIn PDF document text
    • https://korankertas.com/contents/files/pezelotibafirexibe.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/xaravoxejujarekesixak.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/15326196625.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/revipurobu.pdfIn PDF document text
    • http://kco.su/userfiles/file/50872889264.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/18959247223.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/66800074580.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/32145852057.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/77272547288.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613706f81e144---71145042383.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/9816081118.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/6043258700.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/15541151939.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3c39e8616169058f0d9dc29886601dae/pewomazonafidazijel.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/66175260039.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xunaxinajozejema.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/jaxurokasez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=words+to+describe+a+person+that+start+with+ePDF 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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 17848 bytes
SHA-256: 161f6c5539adf4b4a5efe9cc17d48f3b1cf33700bee387ed737928792b2b388f
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10784 bytes
SHA-256: 063d77e9f55ace92b9248bdb44e4d0f8dd4e9340493b7f7dcca483004fffa332