Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad43c28b06d36fe8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 03:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd55af76d0fdd6cab7790a7766cee815 SHA-1: e1667256b82087c12558af26d82e94b36565bc01 SHA-256: ad43c28b06d36fe87acc20372b63c09ae573e23e94d9732f88829919b4a99bfb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dinobajka.pl/Upload/file/pixuvukepokarugaduzu.pdf In PDF document text
    • https://iword.de/userfiles/file/62602377777.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf11341279---994030380.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/22777935595.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/27131573411.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161467430b00ed---ginitodavivofuwajewobuz.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/gawaremoxemo.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/masotuval.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210918181229.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/55132624819.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/84523359961465f4c7ca86.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/25860248843.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vexexobivaxebifuxugovemo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zozujaxulusuti.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/41305560028.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qv0h8k4nbu9rnp2499kd91frb4/jedigujogu.pdfIn PDF document text
    • https://vientangluc.com/upload/files/63715709952.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/botedibemeresujagul.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/121448378217.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/weliguxebiwigagopifixavi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/861db8ef866575eda867367dbd246043/xiwesenitixutuzad.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xotix.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/sewanuvilalorikoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=intro+maker+for+youtube+mod+apk+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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10880 bytes
SHA-256: 36d6f7620a1b6265461e9dbc1aa546f120a1dd32cc6ef439e4fc53b52168394f
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 18032 bytes
SHA-256: 115ed184219aa78ef4b40af089b6fa552dba0541e6948cf0767b1e2d0b38ff27
font_02_sfnt_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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