Malicious PDF — malware analysis report

Static analysis result for SHA-256 221c1723f48723fe…

MALICIOUS

PDF

79.8 KB Created: 2021-06-27 03:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7bc4ec9ad0743f189d7c339630d365c SHA-1: 760b8963c77454376e8aee87eae6e2ea2f858503 SHA-256: 221c1723f48723fe71687962cd3b34758fba03ecb05fa67eca9879481e2761bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/t31n0l2690m8jnh89eboavceg1/61100090338.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609781c453dad---13751928601.pdf
    • http://proxkimya.com/resimler/files/10685862530.pdf
    • https://travelsafeway.com/userfiles/file/novogokidojoxidur.pdf
    • https://aprilboya.com/userfiles/file/75275195848.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rpgm7tsu2f7pugt8q90mvuqe51/naroxaloletixezev.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb9369382---vosomida.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9dadf11b8b0d668a0333a60bc4e5b246/41324242315.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/njdulrdh9qdn568k2rbc2r2vp0/zuvigebajoganevedu.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7398db7a94000de201bd22c0f570c193/47752430490.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/77536444393.pdf
    • http://dieta-plus.pl/userfiles/file/18004900677.pdf
    • http://smclassof57.org/clients/34860/File/tipusani.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077090a6de74---70529560507.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c4b08230---fusoxa.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b165d947ab0---logasikejisizekudabexud.pdf
    • http://normel.org/files/upload/file/kapelosuxebetekisidabon.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/55910437509.pdf
    • http://cuatudongbinhduong.net/uploads/files/xinunisobut.pdf
    • http://hiace-yoshikawa.com/js/upload/files/27582886911.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/lusajapowakelejalax.pdf
    • http://cdmatik.com/uploads/file/91630163950.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f1d5775735705bfbac187b1ba5bc4e19/juwisuginezitudaxarokuwud.pdf
    • http://adabaskimerkezi.com/upload/file/98212812598.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/nibewetetowumugagum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hcf+of+25+and+40
    • 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_off0000d43c.bin
2856602029c159946840fa9334733a1a60f3bda523318c45f7bf1695db768c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 10276 bytes
font_01_sfnt_off0000eb8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16792 bytes
font_02_sfnt_off0001039d.bin
ecb2f546cc977cd509e35bb6317b75caa52b07b3e94bb4824bbcf6ef7af6a97a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 17848 bytes