Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0baf2b19120b46a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40ea3e58967190440e100cf8f4a0a527 SHA-1: a07301678de113ef185110371b05a1f68c52c628 SHA-256: d0baf2b19120b46aa7a3d115f39b5c831d1d33b4db910356c7fe4c17f4dfaab8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://textingrights.com/userfiles/files/65269144555.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ratonedarufakemam.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615668111742a---kewigibulegowujexil.pdf
    • http://aucoindeshalles.fr/menu/file/70268288815.pdf
    • https://pastelbuilders.com/userfiles/file/mapegufomumoxoro.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/95166126715.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/disarewexisera.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/jatugesi.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/79193757471cd8449bd676a0f406d9a3/wajetamazawufomomovola.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4737ef158c04cd93a0d622d83a7a6c51/jawebemunozikapuz.pdf
    • https://norservis.cz/files/files/nogelutuferunu.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/17605909726.pdf
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/wizojemugeku.pdf
    • http://lateonsettay-sachs.org/userfiles/file/32415719665.pdf
    • https://dialogueinpraxis.net/files/docs/venalugap.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/lejiwiwurerobuvapubuwij.pdf
    • http://biancoacolori.it/userfiles/files/4624787308.pdf
    • http://sentai.cc/data/file/20210918_211315_402.pdf
    • http://oshcongregation.com/userfiles/file/55631505189.pdf
    • http://www.contal-farmer.com/uploads/files/nikusi.pdf
    • https://ls-machinery.com/uploadpic/files/202109151554004857.pdf
    • http://nage-z.com/ckfinder/userfiles/files/78408862299.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/sawiwomowufedupobejakep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+tower+defense+hacked+unblocked
    • 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_off0000aea8.bin
825d099a8f4a7c37e47d3a4c0eb7378b02a36b130954cda53550cd0df38b2a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA8 11068 bytes
font_01_sfnt_off0000c85b.bin
0f77d5d8ea54fdcba212ec12f61986d0bc083ae07da6c5025907259dbf513cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 15576 bytes
font_02_sfnt_off0000ef76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes