Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c17f744ce931f20…

MALICIOUS

PDF

84.2 KB Created: 2021-07-04 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 830960179db10021ca237fe504c4cc52 SHA-1: 60c3d38d08fd4e1dfbf952d72259a97369468ba7 SHA-256: 7c17f744ce931f202a3c2a1544229201fa35c4e15c49daadfba5a7581e7441c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. The document body is heavily obfuscated, but the presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f03f3f451b982233f419275754c46446/49860839736.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8710b7b62a---vaputagunokurejumorolof.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/70963455512.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086af771e170---bamiputijufazerapep.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1489338a6---pobubamosufebevasigudajef.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/alj32srbpflrbu5oik4nct4o40/magepenikapetatotoxa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e3f517918e4c0368a15d0a414ac8fc05/10116143162.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/25989858031.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095954d30a70---78153600385.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7bf4c3c3e2f7c29cbf9b789761546036/fumesunagibixirilej.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c83952a3df0df43848b9c9ca0eaf0f57/88127278672.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/14d2d51912d9f3bdeb43c5d5200cae2c/87465040874.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43d9ee970---22688563111.pdfIn PDF document text
    • http://www.moyekolodin.com/files/12295300037.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3037152f2---pumegutisapenabiv.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2d40780e---45512327422.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/40287073405.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d470f10923c8853b9395eade8ec8cadd/34478770730.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609857d6e750f---4721416098.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/fenigegumexonilute.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd466f46bea---12839091729.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3484869f0218fd095b8d89c1f311ac53/wapatukumoxexuder.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/lifudivabewakovuxixove.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/116cf959c20741aa558da4addbb46e44/91233728115.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9e729354---87132736879.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffed7ba677---fimakolazajeteguruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pinworms+in+urinePDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 10152 bytes
SHA-256: 5095b6b59f9865e9ee830975f0935e2a2a26655fa83e0cd278c1bc909735a051
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 16224 bytes
SHA-256: 4d20033b8cc48e401fd2e2b8fbe05f6daa65b65a3d2c4ebffc0a07099e2ef621

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