Malicious PDF — malware analysis report

Static analysis result for SHA-256 934ddac0c957daec…

MALICIOUS

PDF

96.0 KB Created: 2021-07-07 17:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5263a9a85e47816e62ec6c09fb1011f SHA-1: 9c2f85115e00147dcddde2998eb85277693e6f80 SHA-256: 934ddac0c957daec0888391953bb705932a93bfd8f33cee2bdd608881c788dad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/faa95f8fbb713ec4f8eb4f58ce12a37d/80585441130.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b389a06931a---patuvesebirekufevid.pdf
    • http://lutechmed.com/Images_upload/files/94359021680.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e98c6dfb---34985671902.pdf
    • https://napraforgohotel.hu/upload/file/sijerezom.pdf
    • http://willbramephotography.com/givumetudesujomefu.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/686fe7d828ba72245316524599dc2ff7/jatefusufelinun.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/da30da734c071804a8857410dbf4f663/21254729722.pdf
    • http://mintaialuminum.com/d/files/4649853865.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8c8e8169---25537188992.pdf
    • https://mvpartners.be/images/uploadedimages/file/nidirexiwavenusumirezabaw.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/tevewijesuboriruwesejidaj.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2hhkeluhvvvp7rbqvrqu1npqn3/30790873458.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jvjuago6l9qf594l2rsp366dcf516o45/xevakitopuxosiron.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/18403701817.pdf
    • https://clumba-indoor.ru/files/files/jenerofugisuwotetixevuz.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/1827249711.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/65a74094c1259a8c00b8d2d2864556c3/mipupusozarulikub.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb91c7147---duvikufag.pdf
    • https://kidneystonetreatment.in/userfiles/files/winadutudifazunoxisi.pdf
    • http://studiopol.it/userfiles/files/84361301795.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbbbe00f26---jakaponunagifilezeji.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/eqvcmb373f32g8t74ec7og6709/39839591354.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/454da60164d14b9c24de44ba356521f7/zafawevara.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f6981d38---narumugudisufimexojini.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e06ec39ce---59383327933.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lvl+3+inferno+tower+cost
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aec.bin
07be3df09e263d59db0c25f21f021c16d791f80b5c6a1f4fdc2ba074f188d17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 18276 bytes
font_01_sfnt_off000139a5.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 1860 bytes
font_02_sfnt_off0001425b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 16792 bytes
font_03_sfnt_off00015a72.bin
8e5b7860428d630f7d8db86281484861fadf86f549f259b376418f34f0d9d119
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A72 10448 bytes