Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7847c30e3bbb996…

MALICIOUS

PDF

131.4 KB Created: 2021-07-21 01:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09951bb6d8d382c9ee2430be36a86478 SHA-1: ae565861ab097e3bb46e75004b719dffaf8eba0b SHA-256: f7847c30e3bbb99693aa2c46ee9a8dead1835de2a2fa53fa14b29764a947c34c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://tortsurprise.ru/upload/redactor/files/bidab.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cnjrcej72la59sr9jkt3dqolc6/wozufivurujegapejo.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/50259278515.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hfnda32e3mbdbiq7n8e5rpssd8/lewajugametofolu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6105e11b6ae8578336f875257b9456e3/xavijufomatel.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/29132226665.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622924251867760516.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bn7nvguqvoq1hj59t0t4e2690j/88378490131.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xavexezemazopib.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/tiwowisotibezume.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ba3efacacd0f3899ecaa0a19aea25ab/nilemef.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/v8ru124uanmm5ak1u19vqnpv1d/68521638013.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160822ec364575---nuvavuna.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210703134755120.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vijiluwoka.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9701e52ca1ff429575145540c495a2ff/fiworogu.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/70091895393.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c8abeb68---relegalujulel.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/julogixexasekavubituxa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4a44d243da484d5118c15f4a40649bd1/55736279336.pdfIn PDF document text
    • https://khanikango.in/file/xuvobifuwimuro.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210721_91FC27CDC0EC8E9B.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/duligefowirizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jackie+chan+rolling+in+the+deepPDF 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_off00018bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD2 20604 bytes
SHA-256: 944bff2c48fd093e68daedf5ed8dd1939a32cb68ac6dc096859ef824abd72813
font_01_sfnt_off0001bf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D754 4348 bytes
SHA-256: fd0c1627907dd33501f655951dc91381c9515412852757b490dc6eef494e9b20
font_03_sfnt_off0001e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E83D 10708 bytes
SHA-256: 1f218c6d2948b113111e3b0203b82f118cf6be8e2009d2c19d18f6a919d0198e

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