Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fdd2f2417ada7e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 08:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aba48e6bd3e9a4ea703c73a0925e330f SHA-1: 38c5b6280176dbf486d88cb380256ac602668758 SHA-256: 78fdd2f2417ada7e974f053845dcae2488b893475e4505a8239f1fda23c13dcd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zowewa.pdf
    • http://poptheme.cn/uploadfile/files/20210914_124827.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/sexubum.pdf
    • http://antonio-pelella.eu/userfiles/files/zapokumudujebunemegodev.pdf
    • http://abwnickersonplaza.com/uploads/files/27360900426.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/73136535734.pdf
    • http://multiflex.ru/userfiles/file/80819849512.pdf
    • http://aromata.ru/upload/files/fagobafejilarozedil.pdf
    • https://radmangroup-ye.com/rgfiles/file/moxidenepoganewuzesa.pdf
    • http://seasonmediagroup.com/pic/file/79097646009.pdf
    • https://planet-pvc.com/upload/files/rubolupomozalepajamutewik.pdf
    • http://zimmerei-possert.at/15401849041.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/fafimetazutigexifofak.pdf
    • http://www.pacautomarketing.com/file/werafudujezejowot.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/905c69201626dc6ecf8458cd8f9c7e19/1887337475.pdf
    • http://upakuika.com/img/file/27687076714.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135902a0aca2---38749885422.pdf
    • http://civicwomen.com/ckfiles/files/vimamujebenewizazuwunolo.pdf
    • https://heyratacademy.ir/file/53811243146.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c99dde7691e2d1173cf4edf07d5e5d99/11309343258.pdf
    • https://ntct.dz/ckfinder/userfiles/files/famonegegazilemofiwovafop.pdf
    • http://vitrine-prof.com/files/24451280498.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/gimogapikepetowonubalor.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7de89882---95385648516.pdf
    • http://brukikostka.pl/uploads/page/file/65962612350.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+check+api+level
    • 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_off0000ba89.bin
73e491abd829c4b58c282389fa1f8c4c9ce029557efca0d0f207d9e5faec771b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA89 10484 bytes
font_01_sfnt_off0000d23e.bin
a71a291ea2f2ed548525f8d00bd9f9ba6b05cbe39b2ded0e0337aa54e348cbcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 16688 bytes
font_02_sfnt_off0000fcd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 16792 bytes