Malicious PDF — malware analysis report

Static analysis result for SHA-256 580a7c8a5bde9d4e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 21:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f29e581214a0718c836f5063f159524 SHA-1: 08ece6fe4eba1f9f6de8798f3b9cb5ff0cd550f5 SHA-256: 580a7c8a5bde9d4ed59240743daf7d3a710a6fa897b1c8af52bfbd827e2a5057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=will+be+conducted PDF link annotation
    • https://vibanghanoi.com/uploads/files/sixer.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/guxiv.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/89485851953.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/tapenebezara.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/polagis.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/46195839389.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1f0eb9e7b8616a083031d77f9c94e326/26958895441.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079c33d2994e---58601893867.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6324fa20b95c16194e3be3f7ba7d600d/5317854739.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/64714290888.pdfIn PDF document text
    • http://stonebreaker.at/gotiwosiwipabogufopop.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/metid.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/34088078037.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/53c2b02516e5a31ca2424127c3be9e6e/murivasutub.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/gojiregomojinasoravolet.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/letoragij.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/lekulomumosapozo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a2199221---70325106292.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/tusijojuluroj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085748281919---niwelupiduxuzazikevaxa.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/ropafekakevegevepepene.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/86270416713.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/74097147641.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 15252 bytes
SHA-256: aa26a843e357a3ae3fdc05d61fe05b5bc20bbf7b685e9ec9d9561750a4fef5a9
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10164 bytes
SHA-256: 3044cffb4dfceda9c270b72baf826a520a84641696382b9f0165838edfa568f0
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1