Malicious PDF — malware analysis report

Static analysis result for SHA-256 25689d3035866c98…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 03:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f874b1f03463fd5b003c0ba7be8c5551 SHA-1: 04f39715d7f8dc215af30594f79895796de65e71 SHA-256: 25689d3035866c9864450b4514b6c1bb814b758198b8bd7bc01b235685608ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure of the PDF and the nature of the URLs suggest it functions as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=addition+math+worksheets+with+regrouping PDF link annotation
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/4e41825257caf88f3a7d4a776158035e/moterimezawas.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/93c54504c47ce119e9a90f233edc5c6e/redalogowukovuju.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/a6ffjsal4s1h1ulpnlcpota8re/jidiresikodipewo.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nusovuveru.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f4d5e6b0bb8e0805f78e72dcf2c74964/60931890350.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rb4d4b3v1l9g46o6jqin9ma1m3/labekinatodaruwadoriraxuv.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210701_020431.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/10172026097.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107190932467544.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/lugigimupoxa.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/nebebetijiretelemip.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c2bdbd0f---dividuforomejewisumizaraf.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/janomuguwatobiwiwototepo.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/vavirikasonebenebutaxape.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608817b28370e---17823490900.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/betisuwumopek.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c7c6dccf0d60b5328e5daa87c36494aa/saworunaporebumuwap.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607c01887728d---85741335730.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210723_09337CD2EFE81972.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/58009234110.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3cc51c7f06a38cf1080f0390b3b40cec/11791003728.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a4843b69a---53182968631.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xumifapugalitilufofe.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/34011419208.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 18260 bytes
SHA-256: 03fe35dd52f42867a03274fbd79983d71788666fe023cdf14a2aadea58725214
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 11052 bytes
SHA-256: f56aa0265e73ed39ffb2a1c69c2a8198ebbc73f7401ffe1c207e20fe968cd974
font_02_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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