Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34209978cbf7340…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 04:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d16547c3b9e8f43f044c0d6cd5b7da11 SHA-1: 07580f3deae6a23b7dda65904f25dd930c33b4d6 SHA-256: c34209978cbf7340e77f68b2384f97175bf06be551554f022ab39b00a7221a49
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for other PDF files. This suggests a phishing or malicious redirection scheme, likely intended to lure users to malicious content or exploit kits. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://laborke.ru/uplcv?utm_term=rs+aggarwal+class+8+exercise+1a+solution PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0e445245---53905512.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/virawasogefumosemeror.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fc1f161581d4973466a6c9328c02ed16/ganomisogexugu.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210618/file/16239816271931.pdfIn PDF document text
    • https://triosms.com/userfiles/file/vowogelipopazebi.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/mulogoje.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/o1lmo1r7ktntn5vfkdmuo37le0/wozejapedariseso.pdfIn PDF document text
    • https://parkettworld.com/upload/files/25336944891.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc90d00618---fagelulitisetujonevedera.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/foruvusepiziwun.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4e93dfa7095785dd264bd772fead943c/pebogifesupax.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/fovaxokifenesodotajatuti.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2ef27895---muxutavabijufajigopimefeg.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a301945ef31---5620940452.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec471a5be0---fofipad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e009c3a84d1---xibej.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/zedexid.pdfIn PDF document text
    • http://vtaky.sk/media/file/diforabam.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/68918159846.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/26c7ebe0136c2c9ebb67ee64ca2ef326/pisaxagofovitosuligura.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080082039dfa---82051730105.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073f04453802---81473967938.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/nusijoxidi.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/79501591543.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rugpvb9ht7td6bmb1hghubarf5/fasopapuji.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/sodedibusefozukoda.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 18052 bytes
SHA-256: fe086412bb65799d8215759650a9e1154b70e07a22077d9ea2f22e8c00f4f79c
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 10996 bytes
SHA-256: e1c0c177b68c2abf7c6136c0bc6238bc3f86fb5fead81c77235ecc81cbb21159
font_03_sfnt_off000137a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A6 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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