Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d09c19bb850b4bc…

MALICIOUS

PDF

81.8 KB Created: 2021-07-03 21:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 103b081f9edc88c7513a119965a7b2c4 SHA-1: 67f19268dac25279ecb947afedcc235b69601028 SHA-256: 1d09c19bb850b4bce02b189d61bfe962d1d56aac834f835341552920d83d3a3f
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a malicious PDF by ClamAV, indicating it's likely a trojan. Heuristics reveal it functions as a link farm, embedding numerous URLs that point to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URIs, including one using a raw IP address, reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4068

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a9426e29817---wapowoketujopejitovi.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/22422851049.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2fe30e9476bcd93ce4f19710bbd6b462/vewozadu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/r436pejiu539bcicr7bu9j9of5/79733750646.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e3e2626c---widitegosunusege.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/wotejixofopavutisutukege.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf31749d74---kaserowareduvifovepidu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/o3j51fip867gvhli9eq2uaefog/16993131528.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb596b31b---jadezobepodozo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea4858f70---13882108790.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/74564040696.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/79691608660.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/tesoseba.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/74689ac9a6e34f06595e62004523cdcb/gexidiku.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pm4p6skp4576712btujnabiao8/kiwun.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94a3c7b40---jalojaguwatipagelepulu.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/2088320826.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608070784abf3---22298554446.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/5919520982.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c149dc375e7---molokupopitajibebobalari.pdfPDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m6q8hbg1pr5etfefgc7hq0biu9/divujazirusaliguji.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/949b51fd1b294ae9c1d9ed0fd87e2b94/naguzibuse.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/27415196962.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8a75cbc2765d62748d56fd5cd390d96e/24818976123.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qb644f1fvl0k9qvt5dn48nrjih/xomirubidagawumobog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kevin+hart+seriously+funny+123moviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 11092 bytes
SHA-256: 45a5f1efd8e0221d32713a1733ac5a95a3f457e1714d60bd35bdc4f6da086b73
font_01_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 16568 bytes
SHA-256: 13a74016838ce81ab8dcfb9c908f4b86ba0ba6321ff3d1a675e43f781f5dc80b
font_03_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 16244 bytes
SHA-256: c6ba9988963ea80b85c02ca71b9a276902f61eea63bd589648f80633d5d47c42
font_04_sfnt_off00014076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14076 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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