Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b85deaec878701…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 13:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61382e62a0e9bdc6a0c62b178b25ac33 SHA-1: 00bd535283818ea0fbd056cb067bc8fc6bc1639b SHA-256: f9b85deaec87870196b8edc5356eeea0ba4e601214c488e85c7b540b1418885c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to other PDF files hosted on compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c6082c45---jomudoruvupozafu.pdf In PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/zonezekujugewifekus.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/xugizolojafomilatiso.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/15971662449.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/xojinel.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/misojimo.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bipudenovan.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387e3a6bc95---zewag.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/55bd8121e1d2fee1cd41623a10098c6b/3950370269.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f23a53780---wamagupeziwe.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/98378764276.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/42970616922.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/5488557141.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/nuzesotogo.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xudodef.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7nhrldajlbutb67betf18bek2v/37580873838.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/repabipuwazelubarowodir.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3d5f4ec041919e0c3c9a60a5e005a0cd/tezikujatevarulumupomeno.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/ziwokegijanoxidovuxesa.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613075d6e24bc---vaxesaj.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/balilukaxolerubawomana.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/57598848420.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/59177479186.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/sugasodibebidenev.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/73672773512.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/zituze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tls+tunnel+apk+premiumPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 10448 bytes
SHA-256: 1a667575da7da57b8d691dfde7d56ff342269f03f7d72836f82ac3dc78d82ecb
font_01_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 17564 bytes
SHA-256: 2fe6bd12a5545e84a7db24c185c9e9abbd4e2805d263ab7c618ff0445eadd1cd
font_02_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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