Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba732e86ad836fc9…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 01:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed44b1cb6fe5d860f9286fb906d1afcc SHA-1: 38891e47c59975a501adff591b90beeda6159e11 SHA-256: ba732e86ad836fc92e4958cf85b391d4c0651fdd571c1cc704f75cb793a191f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=long+term+effects+of+chastity
    • http://au-coeur-du-temps.com/userfiles/file/39083834129.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/874df554cae761b69ebe10f91d025a1f/84105484537.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/f84scnd9mkobf0sv4r7jcjm15v/lumikunaximili.pdf
    • http://aarogyamedico.com/userfiles/file/nafutoxerizevawota.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vn4ag70lgm3h81cbcb451gfjl0/lesemozulokizafaxesi.pdf
    • http://obasekiestates.com/UserFiles/file/pevewejukasinakix.pdf
    • https://rugsinc.in/UserFiles/files/67759213806.pdf
    • http://zrdb-drogbud.pl/Upload/file/pifolilosizutijawofana.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d2cb8a667051f4ed9d58003869229848/33387007117.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/118198bb2bffc53e8e5a940043517384/21651879091.pdf
    • http://niszczeniewaw.pl/userfiles/file/63317612129.pdf
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/bidusuzabunurojopagekoxo.pdf
    • http://portalpr-b2b.es/img/user///file/_0506415001624832384.pdf
    • http://skomi.ru/img/files/file/mamezirifim.pdf
    • http://littlepearlspublishing.in/data/eimages/file/68135077174.pdf
    • http://onlinecommerce.bg/uploads/pages/files/21154098882.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dd7ca66f---10786439614.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/481b852b84d8c8408385e03ce0864978/83103436502.pdf
    • http://alibabashipping.com/userfiles/file/48026739792.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/fve6s9pf7m7hc13mjl5fiu4opa/lasivulexalomifi.pdf
    • http://nhhs78.org/clients/63854/File/rojaraxineti.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14afe5a35.pdf
    • http://jjmcp.jp/userfiles/Image/file/66506428410.pdf
    • http://infinijewelry.com/userfiles/file/dojozunaburedetunajo.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_off0001016e.bin
1615143162a21b2b3640b6fdd20f2279024b78437f31d4d1ca02796a6fa27c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 16392 bytes
font_01_sfnt_off00012bcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 16792 bytes
font_02_sfnt_off000143e3.bin
14e80d4d99dd3e5799c9be31f6d22cbc5ce7987735439be39d645a596481e11c
pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 10808 bytes