Malicious PDF — malware analysis report

Static analysis result for SHA-256 8382edb1de0a7b80…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 07:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afbc6845d205ee2936e6fd16195519ef SHA-1: a7eb83eb9cf9adf0b928c808b3d44effec5151ff SHA-256: 8382edb1de0a7b80a8cd45d02432f881cfa68e6bc1eac573ff4e063bb7713c7b
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 CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e00fc0d57a398923ffe0470a27ac3962/falodogaketipi.pdf In PDF document text
    • http://beijingbeat.com/contents//files/59076344808.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/pofawikebusoluruni.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/80019744234.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/45a428a47f39fd2232338ac43b39cc69/69243637824.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a510457955c---zaxevopafas.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8ba9f958---ferenelikewanijekebosez.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/54542060954.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xevakefidamuwo.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/tinuzizubobowadero.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac8353aacb---mudilazuvuxofurobo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf3e59152---23889470317.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/865337502feb888bd160318ff15af558/gijuvugilaruzu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9759f45a4ce55a7e06b14a6e49ded16b/71854620769.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/sldiffb4hnnr10d94br841sbva/52590000305.pdfIn PDF document text
    • http://yongqingtech.com/d/files/62924785661.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/85146883396.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c385668c286---gutidamadigobagawin.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4c52f69b4db6462bcb0d68d1ab6835aa/xomap.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/35813175243.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608041ee6dbef---31353836178.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/95593200772.pdfIn PDF document text
    • https://inncredel.com/uploads/86143411835.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j68puoqv88871dfdpgcr8rhucn/sofus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=astro+tv+guide+pdfPDF 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_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 10508 bytes
SHA-256: a5e94498513c1ecb8db639888b343889a9445611b7e1614477745af5c72bbc44
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 18816 bytes
SHA-256: 800aea92c4481d74b0df4feccfde4af96905a19631c3ae5b62215c8bce139f38
font_02_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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