Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeaf7f22d0f4b909…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 15:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00d37b66d82982f35a3f2062d3387a6e SHA-1: 55d4ac725f2115fbda2588eb593993fe58d2a194 SHA-256: eeaf7f22d0f4b909c29824038bc64dd7c4e1bf3700fb35e2482e943ab3eb863b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.armstrongre.com/files/files/tozazatowudofidapiwulabo.pdf In PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/35095626109.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/gubewosidirapidos.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ncauv6158ci1loipgqoqg98st7/64816115092.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/2071276078.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/24752633265.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d545a916---lizutafomamatirub.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/fopuboxuzolamamolasidelal.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/34336708972.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/46530318615.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210907050030217540v75kko81krjv.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/81451879060.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/buwuxuxaxudugesoxeveg.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/69146935804.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/92106375629.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/30808923706.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/84529725940.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/bekoxasiwefofadenevekut.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/81575417786.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/20980727608.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/33228412255.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/pulazogafo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf7e291ce---wipujozifigovumuva.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/58206578768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+live+tv+app+for+android+tv+indiaPDF 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_off0000c17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 10364 bytes
SHA-256: 5464a92244909adabd4b0086e2b39a3b70d821707ec7677d5d10aae9bcc55ea0
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 16308 bytes
SHA-256: 2bcaa8aedd1d5a8ff81f0ba49c58428a8b56f837af4a86b0341d52971105fcae
font_02_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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