Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc734c0caad8438f…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 21:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4c8efe8f417358065a05f702569d3ca SHA-1: a9c13e8ae8cf94ee32198fa996d2eae51b5e9354 SHA-256: fc734c0caad8438f7dd88761e70d6266ef4de4b1dab8d72f86dcc4021be2876a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to manipulate search engine rankings or host phishing content. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f340c2675b---86021758235.pdf In PDF document text
    • https://kermiradiatoriai.lt/images/files/97159506853.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b9d48340aa4d78cff8842a15aac6fe6c/kufika.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/od7ssc3b7jh84c8oc8e6s36e6l/99963561312.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc8cf18a1---52798592497.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/buliwuwazoguderogukele.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/nuvejabi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa193847d---kuwitazar.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/36291789257.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ee2c0d66cbdca06c76f53e0dbbc18592/kozigavuvigugipoxixom.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/57kc34eaqlobfo6qe9edq19i4i/89533422064.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b4644d041dde146e0acd23c15727a57f/49487195724.pdfIn PDF document text
    • https://superchills.com/userfiles/file/vorimudizature.pdfIn PDF document text
    • http://azizolace.cz/images/file/xofozuvezapelujewazato.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/xakulomowovamagaler.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533ce0d3cd---37280625677.pdfIn PDF document text
    • http://teknis.it/userfiles/files/68393276629.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7aaa43e9---65894492003.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eru73t3nvvj44pu6jd68clldrb/56270336369.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607501dd7eb31---41926976147.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s0epvilatibpmf50l1m2hire7c/gasubopif.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806089277ed---mufujanagavagidu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b88a5d1ac---kutebovekebotol.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d03a54a560c03b19674218509b25e633/tepazon.pdfIn PDF document text
    • https://raljob.com/userfiles/file/zanotukegegibajotaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=muscle+mass+after+40PDF 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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 16836 bytes
SHA-256: 55b06d770484d3567aa4c9315dc1d54ff0197602e230fcbbeb82604db3b51437
font_01_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 10472 bytes
SHA-256: 970886bf26ad14a0b79f5f2ff2d9d60656369373b90861a518b3c80d1dfc5343