Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7fb69dac73786d…

MALICIOUS

PDF

74.4 KB Created: 2021-07-03 18:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 651ee1d6f853dbf7982381f4773adb78 SHA-1: 1a4044a5aacff04338b59224d31fb3b2234b8f73 SHA-256: 2f7fb69dac73786d7e8feba83d03a16d7f72a17cbe30af3dd7491506082502aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that redirect to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary goal seems to be directing users to potentially malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://manualismedicina.hu/fileok/file/69132694965.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cdc1903c---93180167614.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/temofenowukofuzumod.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6253a783c38f7a8bff5b8fa9e727b27b/sukedunabat.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a3a137ef---tuvixipowusabiteboxim.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/4f0358ad5adeff407da9b3608128103c/71157865478.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/dowososad.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a377ad0593c---kozexilidakiranov.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9781f19bb---43523064544.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/723cc333a53e14e07d02290ba136320e/sedekoviruzose.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ab8g7k458eufuj03bc64brnivj/xizujobobek.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7063234cbeb467546d01c05d52871c18/zisijidufagitasesevomexuf.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xalapabuk.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e9b7eaf6---86782840597.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090f95a11bda---79467496457.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/52438342526.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/supotemusudib.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/wezamipulovu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee46addbeb---99387560288.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea9f5b1d3---10275188848.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/wirarefefo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/dajemejewoxotadaxinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=where+there%27s+smoke+there%27s+firePDF 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_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 16656 bytes
SHA-256: 262a870820769814fb2754abfe6c851e6677024e6144a228c0b7a53ca9fc834d
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10288 bytes
SHA-256: df31e9e523ecf3007bf9b6313091aa0fe350f0066b111f70d8bfd085648397c3
font_02_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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