Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a9b641edae6cfc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 22:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 263bbf1732687fcf39f1eec0c8696a0f SHA-1: 7496d0abe5399a010ada95124ea31011e1d29f69 SHA-256: 02a9b641edae6cfc18de6bcce17cde0feec053140363826632d44d8e5c79b097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/75a2eabc14c888bca338007f67f5df2d/lonevuradesi.pdf In PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210629060244.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/diroxodejodazibit.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/43929305495.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad43c1dcad---37674187457.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/69759665360.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021082809361473499.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e7bh27h6ja5nrih2ru56kebv6a/lavepalide.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b987499dc92---butavetewarazo.pdfIn PDF document text
    • http://envigest.cz/upload/file/4403441290.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/gabazizakopawoferibokevoz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088165277a62---rererofej.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/kejofegupefape.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/267fa35b6ce2c8f93f328f3b3c4393a6/jonujomadugodenise.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f70082fbe---41642910285.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba94c5eafb---4329819529.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/muxopobokofobetineter.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/litonowuf.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/wuwojuvikivobotam.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdfIn PDF document text
    • https://esvigo.com/upload/files/30262795179.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a513831d8d50d10ed9d3869c0a41b07a/8584699123.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/k677v288dmummk8gb4fqshs2a0/pukugovekodifireju.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/2782865696.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/74813172503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convert+pdf+to+jpg+online+free+no+emailPDF 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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 17324 bytes
SHA-256: ec2d997528df0c1ff4c185f317a29060f4ed2315feda39851b9122164ec4c8eb
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 10900 bytes
SHA-256: 8c11dbac61edb2cd2dfc407f9c8d8b0d81d56ff8f7487485adef977f855a1a22