Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4ba16bacd321a9…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 06:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a25728cfffb147afba5f6af1a8b9ae4 SHA-1: 6ce3287c182042f2c990faaa0893476e33370eb1 SHA-256: ad4ba16bacd321a9022c17c6f25506727164693f612a2fbc40c5d70474e0a805
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS platforms, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://artasedanasingaraja.com/uploadfck/file/74676870206.pdf In PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/76319553221.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/963bedcd889fd00bc5977355f4196b4e/60779197810.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252887cdf---munixezex.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b6b6cae03---wazexe.pdfIn PDF document text
    • https://izometal.net/mm/file/tilune.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210706170659_3ekp4u.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/427b19ef123ba24bbb021dc7227cb3cc/sepikas.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/97243512617.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/divuluxuro.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/87089574005.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vozuxebemenuperum.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/23017214758.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/pawofuduvukawo.pdfIn PDF document text
    • http://ipllaser.in/uploads/72396662022.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/215ad13c3f226c3ad377515362f5c93d/6066642996.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/pobivokedutunaxejupedu.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/zepubopodusuvupigezo.pdfIn PDF document text
    • http://bio86.fr/fichiers/vozejesuramemabakow.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/pubajewedubogepa.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0023bf9fc67eea7ca002d62dbe9144f5/dilifubiver.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/eo5me9k8q0goblj7618npi33d6/54964064081.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/visefirowotoletare.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/34320844462.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/nodivomitupatuworaguvoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=convert+image+to+pdf+good+qualityPDF 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_off0000ba55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 11132 bytes
SHA-256: cc6255e621998e3b1d44db0a9d4d70e9ce6b396a09ed177b3fc6298819000097
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 16044 bytes
SHA-256: 652355e2cf2cd3caf44f8c1d6228cc94cfb78b60f3b8bef807cf63f18b353fc3

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