Malicious PDF — malware analysis report

Static analysis result for SHA-256 760345e88edf5cf2…

MALICIOUS

PDF

98.5 KB Created: 2021-07-04 07:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f5c86e1fcfac82240b443ba2e147fde9 SHA-1: b9cc37a7a5a8b66eb88f3407b3cee4758ce94877 SHA-256: 760345e88edf5cf2f54c2185fb2344bdda314d2cd8ce6a6a2ebcb2cb2eef7e1c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/b8c31c94219666c4c2b7b57a95634b5c/91250573018.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fd2341af1---20801787736.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/63563406690.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c864e0e7d0---lezurugurinebube.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2b45032bb1159826b1ddbf82e05dde8f/54673696766.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/50de58a37db0cc3c0ef750e0655727e9/goxixeje.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/84bc29a0c63c75e9555db5df79ebb1ff/vezasu.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/65655012710.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/sesodov.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/kavilumebavim.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/kazutajam.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/02d5c96b9de55b192fda3f1814e680cd/dugobe.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vujinosesudoduzimedal.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210613101834_ewxngj.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/luzaboxomusegabudadezoxi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/27862726872.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1932bf442---divifujozizebisovozufe.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1db06c89c47846d8eb28f3dffbb4b89f/87533930722.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9nco83k3b266j0jk54ai7ciksl/xefodebeselidetugozek.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a53daf9136f---4945614524.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcb2a75ec---82238720550.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/100760f53f29b7ede36ff35457e67874/54817002953.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/88750274033.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/65530165587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mother+greek+subsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000df4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDF4A 18128 bytes
SHA-256: 902b3dffd235fc50dc716c2546920b9fccccda2a7cc6d207902bd8533d9512fd
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 27928 bytes
SHA-256: 21911e53eb91ab0477dec3cd42de418b10473c94627b8a6f47eee5cbf3458b99
font_02_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000158ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AD 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_04_sfnt_off000162ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AD 10308 bytes
SHA-256: d20d6359cbbdbcc88f2c4e515998cbef5da7eefc19b6f9e4d29654d9334a1e59

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