Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd80b5b3bf7e9e5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 06:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39a89470533a66bdf7bbc8fb33ad5f3c SHA-1: a68a2d3940fc047a817ecf4e040393a095aacfb3 SHA-256: bfd80b5b3bf7e9e5f5dece1a1f1372570e7c22a18495e1b48b685efdc84787fb
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, such as by pressing Win+R, to bypass macro restrictions and download a payload. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=brother+installer+for+drivers+utilities+and+user%27s+manual+download PDF link annotation
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8e8c737e22cd56992fc215d03450d792/10354668854.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/26359231157.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8i0iutkhsaceqt8nbgo7269eej/felizezasonegobepoku.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5b7enbvcts7ss8375ubqumhcj6/boxipabixipeninuzota.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/xatalabovadul.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/22744088096.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/50823905814.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147e780e09---sixunabukided.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/jazekitopomilune.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/dajelarebobogugamugubi.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/dorepukufoteji.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/74539130550.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6cbe150a27858ada46933a02a937fabd/juwenasitemekivojomiwapan.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1481bc17---tazizojumap.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/tetosalureti.pdfIn PDF document text
    • http://stevis.cz/files/file/nudekolilezodezisuwunire.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/kupopod.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/6566634932.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/beteligiwagoda.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/36915770193.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/82766950321.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2bc6103e1---64675891045.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/40015445269.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/41392726407.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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 17720 bytes
SHA-256: 94ac850c15b66f4f075ed2be4fa35188e8d33f65c0374591f2fd2b27b7b08312
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10960 bytes
SHA-256: d273147b815defa636235b2e81b345928f1dd8fb17d8fa546bfc990c4f2c8357

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