Malicious PDF — malware analysis report

Static analysis result for SHA-256 5818a56514243737…

MALICIOUS

PDF

139.2 KB Created: 2021-09-17 16:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ad571108af0ae18b5bb810020bdc473 SHA-1: e138635007152eea402f24b5761ee4526df229fc SHA-256: 5818a56514243737f7259765dc7311b0572d67b2f674c7fc5ba334241f2f9a80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=what+is+the+osi PDF link annotation
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3f815f9de594977e8ff33f76c9edeba7/18841381664.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/vagubujanipumik.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914090853301619.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/puwutinesedubot.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/71081922845.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/at2atsha42t7iu0ud0hphrmb70/zizujebogitolali.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gubemasonuzusesopa.pdfIn PDF document text
    • https://pixel.bg/img/file/69735040409.pdfIn PDF document text
    • http://fruitvita.com/files/files/37339669963.pdfIn PDF document text
    • https://sim2007.com/files/47649859949.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/29983872756.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/n0blu9bp19jsrtr7hecuvitofj/fefuvudap.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/60490411171.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/74601393002.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/5245350715.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/50f71bb39d6a4d0546800479fa17963d/77192978563.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/gavokegugifij.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/xosumapidogiruzakasi.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/65538610429.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e6b04f87d---30335730693.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/99112010146.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/38423005501.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909025931.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/finuvadasejologif.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_off0001bbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBBC 20260 bytes
SHA-256: 5db388d8f28582f61b8f6529225c63b0c3fbe9e3f7d1214abcb9fed98b29aa55
font_01_sfnt_off0001f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0B8 9948 bytes
SHA-256: a40fe67c310824c6f907a6235dd2c2bfb5850881a074e44b6ebeceb2410dad9e
font_02_sfnt_off000206f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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