Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5a8785098827a0…

MALICIOUS

PDF

73.5 KB Created: 2021-10-01 15:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4cc369ecbbbc6e9b1ba6069e24f73505 SHA-1: 5d06efb73bf183e2f01229b2f3b6e3b8237795fe SHA-256: 9b5a8785098827a0ae3b0e08c500e94149bf415b1641628a4bdc02dda23033c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The document's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://homeuu.biz/upload/ckeditor/pages/files/41085621084.pdf In PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/79792447348.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/xomefujomarage.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/77168935261.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/razivuzatuselatar.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/44483189446.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japawel.pdfIn PDF document text
    • http://i-physiology.ru/upload/sapemurotumitufulibuz.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/vufokuwevor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3jfutgmhe1nvircgciqo7es9pj/panaxekimitevilovip.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109101517327619.pdfIn PDF document text
    • http://warehousetraining.ie/images/49969643959.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/27995336541.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/xipekowujipamo.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wefovexevog.pdfIn PDF document text
    • https://majubesar.org/contents/files/vojiwukib.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/48175814905.pdfIn PDF document text
    • http://acelybio.com/upload/files/54767826641.pdfIn PDF document text
    • http://aprt1day.ru/file/gorunomuwexeraxat.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/10605050350.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4d7ec2eec13dd2d869ff0e65973136e6/58185857334.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/41020952462.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613702d696cff---pokinides.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7d62177ac1c6ebfd2598fa35fc1a052a/nokavosun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=parking+game+frivPDF 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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 10284 bytes
SHA-256: dd1a9ec1d16680144c031ee226feb58a26213ee56269ee1aa53fc9d61339b991
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 17352 bytes
SHA-256: f3bbef768814a1fa4a50ca613c52ef65329b3f6a68e350988a7eb7cd09427099
font_02_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1