Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7b05144b002999…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 18:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb0e01c937562eda5f6d8b12ba73b436 SHA-1: 38083fb207902f9064fddbc2f68f1ee49fabedc1 SHA-256: aa7b05144b002999bc1b847dfaa098799776d9c04b66fdbe0d77077026a842aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aymexco.ro/ckfinder/userfiles/files/jilidewatogubobuvi.pdf In PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/bevonutukodozuludolugurov.pdfIn PDF document text
    • http://wsm.hk/images/files/68240698892.pdfIn PDF document text
    • https://mimpishio.com/contents/files/mejomelijixubakuwemiraram.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd7cc56d28bdd7cc350b3faad4b2fade/rakitexomegapanigapegan.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/93771712251.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/80560666176.pdfIn PDF document text
    • https://network-italia.it/file/vavawijixasubesa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134de3c4cd9f---dutowiwi.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/145240818.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/38992988073.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/vopuxab.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/58279507801.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/92442815541.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161337a3c373f7---29432684821.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/vanoxibopiviponiwufowon.pdfIn PDF document text
    • http://www.andreapondika.cz/file/wavazininowalifejetewom.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4fb7218b7---xojopajipitatef.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/63387654297.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/suxetawowagutatili.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/78478376044.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be2b77157---93265628929.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/ropawisidakaribazu.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/melazatezob.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xowipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=boot+animation+changer+apk+without+rootPDF 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_off0000b5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B0 10940 bytes
SHA-256: 9e3880804000d874d84e7b58cafba0642c19e14d8a3e5dbc089be2f9157ce6f7
font_01_sfnt_off0000ceef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 16452 bytes
SHA-256: 1d26e9d4babef12d89c5f524fe353fdc63db2a1e68bd5278290ed67952717b10
font_02_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1