Malicious PDF — malware analysis report

Static analysis result for SHA-256 66efec3d75e9552c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 11:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d64d5ef20bfb80e6e5f3d0d9ee315cff SHA-1: 13488548713e912d238a02b7da3520a3715a46dd SHA-256: 66efec3d75e9552cc115d36ec91f2b5bb054b5ce4fdc0fba4dd293bcf3a7b4b0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious content, rather than containing an active exploit within the PDF itself.

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lr8dq2maddn2tojm356h5dst7q/komogubokalefedekaseloj.pdf In PDF document text
    • https://jagamimpi.info/contents/files/wetizigepapuguvan.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c438e11c544---82341135597.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/64242276540.pdfIn PDF document text
    • https://campermagazine.tv/public/file/reramapenozusopevapotoz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d93ef456f95e66e33a5852316237626e/nexogexuvojofo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da58097e02b---bimivuzapimaxosofamexa.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161249a1cb3041---tifesebimoxetumotip.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/91959516676.pdfIn PDF document text
    • https://kuepancong.com/contents//files/kupapux.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/298079030.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/969cebf113a5b1fbdd70bede107d586c/57599006348.pdfIn PDF document text
    • https://sambelteri.com/contents//files/29208122610.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/tebubowadajawujigaw.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/82750318959.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/lamebepajirotit.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/rabitiripajif.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/vaxelulologosufamaxorija.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb0ecfa27---kowivadazasebeziditi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1616baec5f---42434593482.pdfIn PDF document text
    • https://csn-alliance.com/data/files/76051361943.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/22955830406.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e6646c621106fed4b32f449ea9ec4a2e/90788787116.pdfIn PDF document text
    • http://splogservice.ru/content/file/palusatesivujowokevixebex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=baps+satsang+exam+books+pdf+gujaratiPDF 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_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 15956 bytes
SHA-256: 239bee5cc452a6ab4ba5f961311a4a911e16c99517c08e571a493e25f73372c0
font_02_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 11412 bytes
SHA-256: f516e104d29e4d20887a91057671e70d3d107a36eb4430eada5038029b8dded9

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