Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f8ed655f5f226b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-09 09:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 073840c2c72a2da0b2a1716eb73e15df SHA-1: 0fadf1a1237d5d693eb3e559e5809e9f5c043347 SHA-256: 39f8ed655f5f226bd60f8d05d599715a43d8cf4e85df5f913bef9d15562d3073
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The high-confidence ML and ClamAV detections, along with the PDF_RANDOM_URL_LINK heuristic, indicate a strong likelihood of malicious intent. The embedded links likely serve as a lure to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://artside.org/data/temp/file/fotubekineximewuvovivogan.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6515b1066a---zazijurogajosofilovozogi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/31334845510.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271552202295.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/11e47460a9943fe049f55565ec88fb1a/78311737741.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4bpn0cch672vjf525tu2l8i0eb/58474441529.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef73189569---figulu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fedikemitafunetatavakami.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/43609984126.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/11210856754.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaee5263e---14715415598.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/4719649529.pdfIn PDF document text
    • https://pcetravel.com/files/file/84111191030.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcff728a96---bupujamagomejufinowofokog.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ljff5uh7r9ksfcjgb2lf61mkk7/72218813344.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nawojozimokosijuxifunam.pdfIn PDF document text
    • http://93564497.com/userfiles/99056189327.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/af39feb482c488fda58ff9f02994f4bf/pujivodiwetoxufafevidop.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/febibujupoxufifibufobolij.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41a2527350---56200399460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+are+proper+improper+and+mixed+fractionsPDF 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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 10936 bytes
SHA-256: d5982bbfe48a5262d935ff114c5b2ca9f2e2cc560be913063e36f327ef897a3e
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 17188 bytes
SHA-256: cc8807ac3b850cc5502a80c38ecb905605c10548262576d632e25df02623f3ed
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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