Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6ad454a0db5835…

MALICIOUS

PDF

89.1 KB Created: 2021-07-21 02:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 549f27acfa1aef2cb1f3fe71d653032b SHA-1: cf9f3beb84370f791cdd3586daff42b1a73823bd SHA-256: aa6ad454a0db58356934c0a6a72772377856b7efe61c08e6f58ef049f03f29ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://manisafar.com/basefile/marcosafarir/files/nifiwemagu.pdf In PDF document text
    • http://scheiden-maassluis.nl/uploads//file/komojot.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079800c9edfe---bibapopimeguwabadedi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/fojoj.pdfIn PDF document text
    • http://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/74338306790.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160f7479e2aa6a---57449088991.pdfIn PDF document text
    • http://eventechsite.com/files/files/mumoxoj.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/sewevegujuweg.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/runetadesaxisozutuji.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/746db8a7764ce138af18816c7f5f1fa7/gamapixoje.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/60471776757.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bekorotirikepeselimow.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/genelizusoxas.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/94771587400.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390e24d55f---linolujaxumegevutaga.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/00d467037a8e949d92d3396dbc5b229c/turedawesuxuzijipipu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/623f1e6f1f74b415907ab5e0530dadff/xulasexuzato.pdfIn PDF document text
    • http://techbis.pl/files/file/68981944170.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vbl9hb9r8aafnhsf55stei5dhu/simozud.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/38989576801.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25eb74694---16078440797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+1000+years+calledPDF 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_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10524 bytes
SHA-256: 9da9ff78dcdb6e641b561ebba9e41f2ba2d86802198d1f6fc89708f1b970863d
font_01_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 18204 bytes
SHA-256: 8e6cbe0e1197fada620ee5129a76ffd6ea572684484548d14b53f95292e55652

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