Malicious PDF — malware analysis report

Static analysis result for SHA-256 a061efc327534b44…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 17:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba4f5ecba47a882e61700894809911a7 SHA-1: fb2832b23cc43d395ac92713df06773f015484b1 SHA-256: a061efc327534b4414f3286589772013b3bfb4a61d517e61b4fbee9c94c0dfa9
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on compromised hosting and a lure for a password-protected archive. The ML classifier also flagged it with high confidence. The presence of a download button lure and numerous unknown URLs suggests the document is designed to trick the user into downloading a malicious payload, likely an archive requiring a password provided separately.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/18651541c1a975e183472e8c4589bdc9/vedemonakiledukidat.pdf In PDF document text
    • http://ilksolar.com/Images/Media/files/57809236621.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/vefodavowesulasofomafibu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/razuxewirizezirob.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/pabaxinomameta.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/90680378466.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/wujibovetoge.pdfIn PDF document text
    • http://netflor.pl/upload/File/13458757730.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/67068006589.pdfIn PDF document text
    • http://caythuocnam.org/images/files/losirupezomusezojuripawiv.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/tunaputosadagasusubajez.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/050649372520.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/34564710393.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/8324291429.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40c49568e---sedapifavupunekuwifobulis.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449f0395a---8418123551.pdfIn PDF document text
    • https://sergiomauri.com/images/file/88267537960.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904085616.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/28795661760.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/98168201674.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/6512278274.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/tafeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=abrir+arquivo+zip+androidPDF 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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 18692 bytes
SHA-256: 1e834002f8760a599b02e90f1b25ccbc9efa5fe5516c9f4e761c3bfdd68f4fe8
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 10432 bytes
SHA-256: 1fd0ae3a75485ecc4a84d3692f704429f408f0c7ccbcc1903f067eca0e84bd1c

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