Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16f8e76bd04fa43…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 00:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35458e9d197b9e8f927423c858f8aab6 SHA-1: 6f89256f403da8609a05bad96f3891a2254663aa SHA-256: d16f8e76bd04fa435f32f43610a44f439cf1f06cd61be097ab07455290cf2e53
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 URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/10735357314.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fgopvph7ok9uie8kcumm8r6s1n/jotet.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/63qtuqqchnq3eabt64ols2ci6u/78384742857.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/91842522334.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/lugutamepulupana.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/98626447262.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lipegasijiwutigudo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210517/file/16212006101360.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/kadedolefenumagakus.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/nilijevijutojojiraki.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc433b07eb---nilaxile.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209f8126b6---bogasujojokik.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/093f656c28db68779bb3d0485404c812/79474522097.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/puluzibilibarudipuvakig.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960dcf1c19c---17819707282.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052115094373499.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/21609958818.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748a8e4454---71423297561.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128cfd78c4b9---13517585479.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/ratedusatirapoxoxitanepen.pdfIn PDF document text
    • http://otczenacts.com/media/files/zodezibi.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/6536865580.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/tovaguxitetimidaju.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610688c8b6af9---josob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=otorhinolaryngology+textbook+pdf+downloadPDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 11168 bytes
SHA-256: 74facc1cf9008104e09e580021cd765b4183f078d0e93712b307273208cdc642
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 17852 bytes
SHA-256: c45d81053f679df12179e59a48981269888a503c170d516473340d7a05ebf01f
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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