Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c15ab60bdf75b84…

MALICIOUS

PDF

87.9 KB Created: 2021-07-04 07:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 374a94a134d2a99d4e1d50316483dcfd SHA-1: 4c8c535350593a563bfeb6594d51c5fde37bdfb0 SHA-256: 5c15ab60bdf75b8412a87e99323ae5cd8177c416f028fac50ca3b15fe5f32bb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a864ed5562a---80816746189.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7bc0d5ae---litabujutegitiwanela.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bb796306---75910687216.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/jamuxibanujidibod.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/41qpd9fkm1elan0na91r6op6jm/83178986975.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/22736270479.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027a1a86a9---jolek.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6af9a64ed4d37b63d5ec2e4a38575dcb/17987180430.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/10330758342.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11c6c9086---45415441394.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/748b07f0a4d5c47408de77cadd15112a/wasumeretiju.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/74695661591.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/polobeduderitimafiwup.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wowesawasomajobevoruwudat.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098522ed114f---bopokabiwelemubusalis.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/60285079057.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/81326076650.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/37714260768.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/bofarebaxadatibegono.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/vomusugotamimusemin.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfed44bdf---64107004655.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/10c17a0eb3ee38923d3a93cdab3ab2f9/4713399917.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/rosuvelesurixakenudu.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/jmn81it65b00dovp1qoan3vfjr/kipokaxivewosufoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+can+i+conceivePDF 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_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 17224 bytes
SHA-256: 0153ccd558ae4d950d60c0e27d21dcba8d11008929520a5c8913b83dbb4568d6
font_01_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 9952 bytes
SHA-256: 2dc09f3cb190c46244c67dd3cf81cef59ecc4f632103fc0debf1e2b6c4bb3a2b
font_02_sfnt_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1