Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0445d6a8519fd4d…

MALICIOUS

PDF

91.5 KB Created: 2021-09-03 04:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9f129291ce3237b3f146cbf61c5baf3 SHA-1: 5075542c81ccb91aafe8314346049b8b9caa2057 SHA-256: a0445d6a8519fd4d15cbf83463745c13c161ba81d38e68fd7229410c8ba4b692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress upload storage. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://americanewbie.com/userfiles/file/regaporazureluva.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4c209517---mofeme.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/56506768132.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/penawilineridepowurirado.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/71682265820.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/cc596305c769e23bf14a719af36f591b/72199932194.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b0275e412744f91be20f3dcb2bb37f37/18686661191.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210830154847.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae293ffc8---42643866568.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b249b86a199---90033543556.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lunowutunibomedorukumaje.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364f471733---84222471105.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/besufupof.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/jiwewutazedosev.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/peguxemilutosekoxap.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/86117678347.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/67438758539.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/70391442750.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985939bc6ae---6638739131.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/xovasutoxifa.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/13037776233.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/furebedikeniboxuluta.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ae38a561b---sojinon.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/dedabazuxekubujamoguvux.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfceb5bb354---nijufigof.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/4429742375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=current+affairs+2019+pdf+download+in+bengaliPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 11492 bytes
SHA-256: 4fad0e8244f79980a3bbe4896c0fb1a5898aa805f4170e2d04542bc563943070
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 1760 bytes
SHA-256: 5fff00743cbca99111c2a7ac28d1b3d5d8f2da3a717fbbef75202c4a137a6772
font_02_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 21416 bytes
SHA-256: f82fbd787687280c9531294e8f9878a1517a4399a9c24208571ccdf94bb43627
font_04_sfnt_off00014862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14862 16384 bytes
SHA-256: 5fc316b0841e2571e4e3063fa413b0557a76a62671b4c87e17c59d6ae7e65cf6

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