Malicious PDF — malware analysis report

Static analysis result for SHA-256 3739664c96f30750…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 13:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 988d5c2dc64bf06011c71affad8d1b5a SHA-1: 31bd746689a4654bb7829b3573d015dc5c519fe5 SHA-256: 3739664c96f3075009961386e1302f563edec42e8eb4c57519c73a9976766744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ipcmanpower.com/admin/style/images/userfiles/file/rekegufatujil.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7aacc30b---razizutib.pdf
    • http://sungder.com/upload/49909472073.pdf
    • http://cz-synergy.cz/data/file/35325565475.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/bilixebob.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/virazafefebuluzikij.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pinoxukifuwilamibaril.pdf
    • http://geodez.com/pliki/file/33835153823.pdf
    • https://rainbowfurnitures.com/files/files/55770419102.pdf
    • http://rc-modeller.se/images/file///wusifuvusoguresaro.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/58027315803.pdf
    • https://lensmam.com/userfiles/file/26931420457.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/26614784292.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xofirodelorukitutawiru.pdf
    • http://eurekaelearning.com/upload/news/file/9448867740.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/78114486607.pdf
    • https://mentormedya.com/files/warudojotudufilalufovo.pdf
    • http://mayjack.com/upload/files/31127156803.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5c81d018a47dc88511eab282ecf60858/jowuwok.pdf
    • http://slavutich-media.ru/userfiles/file/fifuwofulupotepikebini.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2cc8f80503a87a8c0884dca716a39638/bopalamuzijilejawo.pdf
    • https://ccskin.com/geektic/files/mupesedafexavofutuwasukoz.pdf
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/fasozipoleledawexiwajil.pdf
    • http://w3-japan.com/js/upload/files/64708034999.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mad+mew+mew+fight+simulator
    • 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_off0000b3d2.bin
ba8f07ca38b2e9592730bf2633063342628870cec4e3685ab8ca7cdb83e4d746
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D2 17456 bytes
font_01_sfnt_off0000e13f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 16792 bytes
font_02_sfnt_off0000f956.bin
743b58a135306f6e8942c5b485db93fc7e15435215123fd3576d7c355c04f67e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10876 bytes