Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3710be0354970e9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 05:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc12df51ff02940cde074ede7ee57ac2 SHA-1: 23020bfa1f2e4e9dad412c55b3d18774bafdba41 SHA-256: f3710be0354970e9d002c971fffb9f2c28fbcc0823b6e8f7b166149c2da270a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is used to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the presence of numerous external URLs points towards a phishing or malware distribution scheme.

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 https://pixomot.ru/uplcv?utm_term=character+transfer+cost+wow PDF link annotation
    • http://www.radanhorse.com/resource/files/54311839261.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vd41m7m6fl9bu7vibq85ug61vg/wuludabedeme.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q7dchq8bv2gcm52rjfbkqkqnvl/megegubivapufekebitub.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/57396959546.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/sowijefizo.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/98016916172.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160989c080d8bf---kujilefalifap.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/pazuripolofoziva.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00370ca64---kajabexafilemobewelopov.pdfIn PDF document text
    • http://egitara.com/upfiles/files/89765979026.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e8fdde22b---38630355389.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219d83547da---debazegadulam.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/70615089120.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a108c26aaa1---vokukarifopiw.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021080100542786.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/704ad15laatt76p611sag4kc3q/10445229453.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a980909d279---mumalulolufalarupitevew.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/faaamiu86h1ir68b2iimki6633/litukerali.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/51746762415.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tovilofukiwerobapoju.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/89580420896.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/89036296011.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/20178151981.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/jadaja.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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10412 bytes
SHA-256: 67dd3f8af1eda9597e533edccb24e40de0fbbba1933aa06a1e5d19e530e2ce07
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 18012 bytes
SHA-256: 7a2d3940c0bef67136447af646c6a268eca0825ce5d412fc05a76dc8024412fd

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