Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c1cdc2ffdd9c3a…

MALICIOUS

PDF

83.9 KB Created: 2021-07-14 01:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76343df815074b4565d0b999dca81e78 SHA-1: 91f2f079a7f23130edc3efd62dd734ff35419fbb SHA-256: 63c1cdc2ffdd9c3ad81add635299a71bc851f9e4e847dcb9f43855d9d9f36e71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure and content indicate it is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/975161e2590b608554c15e7ccca4b298/jabuxaxedebokiliwenonaxa.pdf In PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/lonazefidazeb.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/22377029034.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vevujesewe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a877c67dc7c---kobewodasuxe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef2f42e32---sopelere.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be141e59f3---favemonanubunu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f05654385---xosijekamanabadibazo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/pexasu.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/77229211318.pdfIn PDF document text
    • http://mamam.by/upload/File/file/kujabetujevud.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/5939153522.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8328b90fb944e289662bebf910680f2e/80767496786.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d5357b79---11974693403.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c2a9dbcd---96008328563.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/mibisosuzidibijorodamis.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/7666761843.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tekekajeluni.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6a6e1a6b2---81374407897.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ade427650378de106ec5c609eeafede8/27450144929.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/40161717786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=associative+prop+of+additionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10616 bytes
SHA-256: 36b36abf2b905d1dcd1e2515ab7fb89252aee716db49b13dced0323b0cdfdace
font_02_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 17160 bytes
SHA-256: d554b3330b5a68756b32106f705d7ddb7a9d0dec09bf229367ede1e1878db9d6
font_03_sfnt_off00013a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A69 1676 bytes
SHA-256: 08d3d5576007ac795ae6719f21099a96d4af1de6057acb6b0f60637119274493

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