Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1086efc5ea9bb2…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 23:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d4f8e1a83cec99706ddfea5b77e5eea SHA-1: 25f9d7f25575aee3f3725d1666d0ba9531b624ce SHA-256: 3e1086efc5ea9bb27f546e4e364e3f5ad7cb18026fec64c884b3c4d6216fb2b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates a likely attempt to lure users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://chcial.ru/uplcv?utm_term=2013+maserati+granturismo+sport+owners+manual PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb49d0adcb---rowixitugimum.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ebeb1fce0---furasaranapudu.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/jedutilifuxabopesiweg.pdfIn PDF document text
    • http://sushi-belovo.ru/files/52758257783.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/29813659306.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/de175bee27daa66919105921d9f2c844/70696298639.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/3820689475.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/69481ad023f7417cefa6ead746258c11/4790445728.pdfIn PDF document text
    • http://raczcsalad.hu/files/10347114327.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/segafevogirujaledu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/613eb388a55705eb9cf1e9939457a3fe/27753926498.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c537009f130---59971667101.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/61658578395.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/risar.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/7232600567.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/jufagulatajinit.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4caba7a5aa454ea3f885000334f23873/24336446998.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/85888923772.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aea85f01966---zuvarimezosikekizonubi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085be7412488---wokuduvoresapukodukoba.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/mibolib.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088701096cbf---19947544930.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc71924747---womamurexaxetozamumiwikiz.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/61328244065.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210715190843.pdfIn PDF document text
    • 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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 11152 bytes
SHA-256: 7c4393896de45e98c70abcb0fa56801a66dfdd3d03c1e55a768ae03e6116f7e5
font_02_sfnt_off00012626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12626 17308 bytes
SHA-256: 282728a8e6709aa938afa4efd3c50becb94cde2ba681f9c89c0c58a866a74629

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