Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9752e71461af9f0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 06:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ae167c2e8784223dcf828f0a74ecc67 SHA-1: 0e60169e5dd71e3c18c0a8589d93d2717924422e SHA-256: a9752e71461af9f03332a0a14f586c521aa51b4957f3339acfbd22ce1799fd79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://njchemland.com/upload/files/gozirixivesaxunizemo.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b612d8a34231f8ad03d6062b29bca57b/85792696087.pdfIn PDF document text
    • http://tid.vn/upload/files/72203885860.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninewusewetakiwutit.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/refatagafinevigabu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb546deb---85826825375.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/takamameziregufituga.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/rebuzolu.pdfIn PDF document text
    • http://techmechengineers.com/uploads/79366954370.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/82444364682.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/52721491788.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/tidag.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/52421167151.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nepaxopebokuligoxederi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/12256315910.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210904_104847.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/88470382808.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/76991912678.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/mevenebozakokixot.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/xezifirokaritajuted.pdfIn PDF document text
    • https://sergiomauri.com/images/file/tijoxiratogetomerefoju.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8b2718620eda1cc30cacd5bc8a379cf1/lezaborinepe.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/dilosuvesipamowogofuvekof.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/24903325885.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/nifofaluredub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vlogger+go+viral+hack+iosPDF 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 10432 bytes
SHA-256: 35b5288ea51e84e62c36bd3789cc013035eb1adc9b159ead5a671dfe5365150e
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 19740 bytes
SHA-256: 40fd19279888ea1b2440881c2fbd8a71b8c6386f81b0a082c58a0dca2fe9a418
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1