Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab5dc40ade58db3…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 00:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13eb825985b97acf6a8e4ded338d7321 SHA-1: 5bf67d1e0b1a27f29a709dac313fd72699667466 SHA-256: aab5dc40ade58db33d021d43d0ec685e9bc499cb13e891dbcc1dbd326fee9a10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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.
  • 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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2bd3e822720ca5a703f06b5db72de9c6/kadenogagizojajepevap.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21aee21da---62646347337.pdf
    • http://allprintusa.com/admin/images/file/24199937112.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/boxasevemu.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4ca32c77ceb27e11e40be3e19f35b77b/66020558488.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd10301a62---jixupugemi.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd488682e---7648822065.pdf
    • http://hacoauto.vn/upload/files/25822373010.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c4f533ab---78165690172.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/b5f6ef7a4caa8c6549648e43d7f8e636/fuxerajo.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57f114007---ritefazeditubebetewoze.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d4c18e81---81526295073.pdf
    • http://musclecar-taps.com/js/upload/files/40152188161.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d5ae10770cc11d51fd350ca3d813a5/gijamojanoxajomowefuse.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a53185433b135425e82605607f79b4dc/nitedi.pdf
    • https://nhahangbienhaitien.com/uploads/files/17100762114.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a75621071ce---nilaz.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q2a617f2tsft29t1n2f21rsa2b/33615730730.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hnergo8oocgkditi0v8eeph33k/kibekalabunavetomax.pdf
    • http://sskj.pl/userfiles/file/tixemavupumo.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d631ef2c1d---41513905695.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160914ddb3e4a3---8427635393.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ffd3b4a61bbe2c5bdac98a7054cc761c/77844579365.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8b2ddbe8---mefowovalediwokax.pdf
    • http://world-green-hope.com/uploads/files/51623322951.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8fe0e09dd---85224551131.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=checking+certified+mail
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin
7fa65c0dc9972589441f8d8bda808d6bcc85b3e618eff6472f45011815d2034b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 10756 bytes
font_01_sfnt_off000106e9.bin
ee1bf5b8fb8aa84147959f3e3257d1d55b74a00e74cf2e09196a51e2f61a07c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16200 bytes
font_02_sfnt_off000130ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 16792 bytes