Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac49110a8313f87…

MALICIOUS

PDF

69.9 KB Created: 2021-09-01 09:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aba4732c98ea5e41393258a647e2b674 SHA-1: 021c575e6437ad41b7fa9630862a08159f8763cc SHA-256: 4ac49110a8313f87be1fa7f9c9174ea71a1b2543f1af28981d4e5bb359bfd0dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and heuristic firings indicate it's designed as an image-based lure, likely to prompt users to click through to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=toys+for+tots+donations PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fe4827067---81193144405.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/39626514581.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/94c8ab020642c2b1e4ac765d249f2fd9/viwofebilosulimu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22479632211.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kiligigazosanagajaralub.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9a404a36170b2fe5cf747b3f5eefd722/81395568972.pdfIn PDF document text
    • http://foxadv.net/file/zuzejusune.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080158cd2e25---94102581328.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5pg18jj8efqgsekhtakim8pqg2/41982177216.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/fabokugidosawemopuxa.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/loriwufa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae28a72701---12043543527.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6dda61933bccec2663f791d57e4c863e/bulodipuperu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/55831285322.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608228da00d9b---wixitagilomukofebinuj.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/59694120117.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/atohmb9vvtk0i3i4dvvvgvfrq6/zaserurejudixoka.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/61083194333.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/goxumirumubolexuba.pdfIn PDF document text
    • https://bamor.org/userfiles/file/mixupepewap.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/54873077835.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/70074554185.pdfIn PDF document text
    • http://ipllaser.in/uploads/71679150496.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/ruronobuniraxuviz.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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 13620 bytes
SHA-256: dfd5f435d77a6ac50ba40cbb49d5f29b58a3140016b07c4ca20eb8465f1eaebb
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10244 bytes
SHA-256: 1044b2bcde207f00f7bf9eed3375ddee9b2ee97e504dfc41a6ff80c9a6167981

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