Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cfb09c17770d7c…

MALICIOUS

PDF

88.9 KB Created: 2021-07-17 16:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 11eed254c9d12e3fbf7ef2d5eac295c9 SHA-1: e3fc5a353157315d94aa9509b1f4c3a0e9ddadc2 SHA-256: b5cfb09c17770d7ca453efa690e70400a4d39b9d1fbefbf1abcc6ec05dd9bb35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to distribute further malicious content or manipulate search engine results. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e453764c7---53211483682.pdf In PDF document text
    • https://ilmercatinosottocasa.com/file/13333155703.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9cb65228e76fce85fb2b33b76896ee48/56711256479.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/livitevuvetofemak.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219f0c30ad---96342064819.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3m6elt2o5rt23sng0uarklasa4/53593215236.pdfIn PDF document text
    • http://saptpadi.com/files/file/sarepo.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-11/20210511035534484631.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fojinegedijarepu.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3kht8e2p6fqtb33vs5bf2vcpf/45651123120.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nudusezukozujidimuf.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • http://premium-t.info/files/files/tenogejizokizigolunowu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/savulelutozesogojus.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/kavinubigijelewilivopokim.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/sazitalupizafeba.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tadetuwe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9ca38f16---47428214494.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dd7a8574ff49ae3501433bc787470876/56546313421.pdfIn PDF document text
    • https://negaratoto.com/contents//files/napuvut.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vufudixapebajofetob.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/tewekudamu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b436f14a20---93709455837.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908dcb4a766---xutukevoregamavewad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=math+for+competitive+exams+pdfPDF 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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10896 bytes
SHA-256: 88362adf1bedad70ff9a8641caadea6356a03d6db737967ca3dc3831cbf7673c
font_01_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 18776 bytes
SHA-256: 16cd4d4624e9964b1e3436d2055046dcfc7ad15afe6060dbb83e629ff64e366b
font_02_sfnt_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1