Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f40755180b109cd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 14:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05ad84efe68f1c0752e4d6f73ab562d7 SHA-1: de7a79c5b8b6202710b6cf0a34327ad844590330 SHA-256: 3f40755180b109cd66719e3b26563424a2fea695c5297ab1926f8b52889bf7da
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. A critical heuristic indicates the document instructs the user to disable security software, a common tactic in malicious documents to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://chcial.ru/uplcv?utm_term=smart+clean+pro+apk PDF link annotation
    • https://hatinhjobs.com/upload/files/98983974814.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/suxozasemulukagawor.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/46270959499.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315667ea7d2---61852960667.pdfIn PDF document text
    • https://luminex.pl/upload/file/69497016341.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/ledukanidapov.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/nekipusametotid.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/vobalomotubekenunal.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/sirogidazofitiwijo.pdfIn PDF document text
    • http://meta-min.com/files/begima.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/fukatitikepivenizuwewa.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zaxabukirexaduwamubi.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/zopopasatevewunujaf.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/razuvituxixazudosototuk.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/gabiwisamivi.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/34230568605.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/daweraw.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/getorotebapebu.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/26601473530.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071338256412.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d5a6677b98da56ab37f4b21109d0009b/93969973878.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wadusudosaxinolasipelalin.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b41b17e8c915bea309c856773022b9f4/8493912397.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6b12cc58---latusajudulof.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/23070655548.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/83239835567.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 18080 bytes
SHA-256: fe6ff12acf30fb85c6a1e92d508325c657d2c23aa3538b6aee745e4c2ed5270f
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10444 bytes
SHA-256: 23a8da504bb51d1fa8a1304a60c0dbdc1159a50e89c150a9f34d4642571e3a68

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