Malicious PDF — malware analysis report

Static analysis result for SHA-256 e652f359a294771a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 10:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32dd21210c0f31b91cc690d60b5171ce SHA-1: a2a8dc99334fc703bfb5187406d30384f1c7e215 SHA-256: e652f359a294771a9b4e52464e5c2b305f14bae441a0ecc1ee5edbd593ce9eba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'download button' heuristic further supports the lure aspect of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=yt+mp4+converter+4k PDF link annotation
    • http://logtech.cz/foto/Image/file/73828094013.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///42797392951.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/24809718612.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/5822997328.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/magugavadipil.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/pemalenodepo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399c6b9abb8---mujezugubitajovoliboj.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/47753318861.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/49183985921.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/xabupivixutonanikixub.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74608739326.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a873b841ab---86787883416.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/lumajegotafevatubirixe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nojrg08u27gd1svqub9cr885o3/9051544611.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/30s7ckkud75h9vp2s3jkkqhf5s/258638748.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/41691225465.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/77034987651.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/27599930241.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5dc29ecd117624f1d7811413da2183f3/46613940831.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/59955452804.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db19c096e4---26446114630.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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 10288 bytes
SHA-256: 520d8cbc96b464fab36be3ecbc33e31791f37ab92f679d2f66c27a60f60e8072
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 17088 bytes
SHA-256: 47cac5aa63cdaf1f623068a35aac5628069c62303fdc49a70c0293e5a6b2035d

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