Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4db88ff63a7922…

MALICIOUS

PDF

92.5 KB Created: 2021-08-10 14:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e124bd8d3f1f988b537fba1920409574 SHA-1: 93533ce9f9f8ac2fd168ec234c0bb9dcd98245cc SHA-256: 9f4db88ff63a7922a34284a581ac894030a584507519a116e91657535ffebd82
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign leveraging a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://medvor.ru/uplcv?utm_term=intercambiadores+de+calor+de+coraza+y+tubos+calculos PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6b4c26f3---95484773385.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/357cf32c1ec3341061816fa4a61237ee/lodujeludoja.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f512c4b828---16361977498.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/50015767434.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e129b91277868aed63c2465860e7a506/gudezukibikedinar.pdfIn PDF document text
    • http://slsnn.ru/content/file/zidikuruwonasobesovepokap.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/38549552423.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df848176971---simaju.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8ad2d0479---tigapamed.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/33858190061.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a49bba5777d72e80d2aca81fbd98da64/39174760499.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nisomaripugofodujajis.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/57405591436.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/96glukbusbsal4tn47re0aj0j4/resatujepofevonovu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160895e49f4183---50500812025.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/xejerosuxebatiki.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/26740315023.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/81855463441.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46d55f6aa---lefabatamuwat.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/48480030291.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 18516 bytes
SHA-256: 7cfb9a6467924aa486073760e11ce141e118ee93e7f9d4241fd46576c102da2f
font_01_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 10896 bytes
SHA-256: 67599638ef4e948f431650290f4124dbbe0a60f23edab3aa789c244b75b3f973
font_02_sfnt_off00014b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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