Malicious PDF — malware analysis report

Static analysis result for SHA-256 117f02205c6aa7eb…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 21:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d329d9346a3b66515a7864f2eeda2d92 SHA-1: 6396d8cd740ab52651e01f98e0dd36d80b53d96d SHA-256: 117f02205c6aa7eb4e6dcb2a6e053023df3fb7f2f31ba03352e235fb0dac5697
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alimentosldm.com/userfiles/file/10795967918.pdf In PDF document text
    • http://oreoltour.ru/sites/default/files/file/zowebevinadig.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9cc122932b9deb4e4e41e040fc2ca49e/suzijikepu.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kovorobilisebikuwime.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93345245751.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/35087704006.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/rogasibaxirumeribenej.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/46730945583.pdfIn PDF document text
    • http://unseretochter.com/images/file/88560287666.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/sipot.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2c7037f1fb9cabe027e91427aff6fac0/5329164422.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/gidavemoginumokimafidas.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_142223.pdfPDF link annotation
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc115cda7---vozosinogipolujope.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/13267529033.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/18164072196.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/nebodudovifedadutuvufem.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b38104f63---modobifevaripoduviko.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73889409245.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210914084338.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/33664835498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=group+video+call+in+signalPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/50314625629.pdfIn PDF document text
    • 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_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 10796 bytes
SHA-256: 011adc6d99f21ead3bb2b2da805b9390365ac5bc956c0f77fde2055ebdd4f8c7
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 17480 bytes
SHA-256: 9184f3729b35bbfe615189b1790a40594cf99bbaf5b25f6b803c355da052ac99
font_02_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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