Malicious PDF — malware analysis report

Static analysis result for SHA-256 9162ea62c384ffb7…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 18:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abb1572ee0987b4389e83ff88f0e7476 SHA-1: e9a0828fd35fb8905dca579b7d755cf7a00abbe9 SHA-256: 9162ea62c384ffb7d0a255a8c26c5b16c248a2e65aeb8daede6007d00f6cacc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, forming a link farm. This structure is commonly used to obscure the final malicious destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/puwixejapadog.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c773295cfe---kidulovuxivarunovirezadil.pdf
    • http://tyextractor.com/d/files/binijiluzafaredesag.pdf
    • http://xiaohecollege.com/d/files/43898137739.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1138ad18e---fuxofimumidozekod.pdf
    • http://safires.cz/ckfinder/userfiles/files/32340707583.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc1055875---89886041164.pdf
    • http://geonatlife.es//ckfinder/userfiles/files/73160844771.pdf
    • http://amadpich.com/userfiles/file/81083820782.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f04bd06dc6---vetavur.pdf
    • http://twfbs.com/ckfinder/userfiles/files/18557186572.pdf
    • https://hasekei.jp/userfiles/file/fodezinaroninad.pdf
    • http://fitviewer.biz/files/file/zezuvojeko.pdf
    • http://studioarchperissinotto.eu/userfiles/files/zunejawosasagarer.pdf
    • https://pet-fashion.ro/mm/file/xowofaparimewe.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e5ca2a993bb0f20e438ae1c6135b8bc6/75817242283.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ffed63bceca8358bf673ab141f862d67/gakalagivabodonodig.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e869118f8ae85d210e1532702991fa58/pajuzarotapojasuzopol.pdf
    • https://aterhesseg.com/up_image/file/luvodasukulibuka.pdf
    • https://srmhospitalities.com/images/bulk_images/files/xiwenof.pdf
    • http://sissonne.hu/editor_up/41686435264.pdf
    • https://koreayokogawa.com/ckfinder/userfiles/files/kapanesojowef.pdf
    • http://brkvinc.com/userfiles/file/suwunedafudedimedavomij.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/86959326627.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=maths+lesson+plan+for+b.ed+in+english+pdf
    • 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_off0000e42b.bin
a7a838bc37240329d19610b65594bd6c264a293262ec1094c38721710044417b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 16612 bytes
font_01_sfnt_off00010f84.bin
5f1503fdea11366788e7f64b2f29a73279a97dde3d52bea31e94180394d0d5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10976 bytes
font_02_sfnt_off00012879.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 16792 bytes