Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e2a04cdf8a4cdb…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7f52edc9502f1418ccbb4b0f36adfeea SHA-1: 47fc7788aa605da65b43f8efe52a2553093a6920 SHA-256: 31e2a04cdf8a4cdb7c17f892fff8d488c01484ce52f82b9155cb55748687720e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://autosaloncenter.com/uploads/file/17201177182.pdf In PDF document text
    • http://kzlo.pl/fotki/fotki/file/pufodovuwilonijema.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/64263224505.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/38634427060.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gp23a0stn6hs4anu82huj5gtvg/14311754236.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/besumijapefivapu.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/jukug.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64844eaa43---54432883686.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b87813164---63173489433.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/13468153584.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ec07d5fa7bf0ad1798e93e8b131b99b4/pudiwavavipejiguxa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/xabeboletugijoziguzofu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085a22d6265f---58263987848.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/18b90b0d2b007533bdf235c89e1f207e/92841939236.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/6790941523.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/25738333085.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae2c189e1---sokavirakirimopajemupo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4a8384651afea7bec204856c4a643e53/gadawodekizi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/daxafapovidekamoxu.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/50369100231.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/sifemobekise.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/getizab.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba077f1fb23---8692467894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=famous+female+evangelistsPDF 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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 17904 bytes
SHA-256: 103f43620d7162cd3e0a52b5ecbb2c1a51e5bad2a2ae13bae448344cacf3fab0
font_01_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 10600 bytes
SHA-256: 11ef5766bf4a06f234da4c9c292c29a6b0e0ed1f773c949e9de0184a6a92e4de