Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c9dbd1700404ec…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 02:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c2f7725471fc0861c387e4eeb4275f2 SHA-1: c6a44d9cb6eb3118cca354ae67622a17ab71f4b3 SHA-256: e7c9dbd1700404ecdabbfe04df0da802070522343798fda7c75c82d4bf80a399
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, indicating an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2700aeb3e3---10420307284.pdf In PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/rulepefuwitis.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/bilezijumodeziwuki.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa06929ea3---79952098114.pdfIn PDF document text
    • https://yorapp.it/file/kisibemox.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2eac017c2---gibupixokisadokajazupo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/43480078113.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zaxukokuxa.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2ca51c11---sububit.pdfIn PDF document text
    • http://skupka54.ru/upload/m/53526695617.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5759056741c44fdc22175f68c18aaee6/jefebixexaba.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/25830780323.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/47573515752.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/rabenizaz.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a49fea0c43cbfe461f2a34d6275cca8f/tofote.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/dademadexugemelojoruga.pdfIn PDF document text
    • http://adveotec.com/img/file/laluvulokojabujugoga.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094183a76309---xiwudabizuzot.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mubidunarigizozone.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/42455703138.pdfIn PDF document text
    • https://actorconseil.com/files/file/dijoferesilobabereton.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/95642860811.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/fixazutopu.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210610201744.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nifatezut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=crowding+out+effect+monetary+policyPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vadilixudutudibawujaz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 17104 bytes
SHA-256: 320e5547064abd1283b0e0a2d761c4f64e3425cf752ad2eab8f1fbfaa378be36
font_01_sfnt_off000116a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 11128 bytes
SHA-256: 9a8415f11b64545d6fc28527bc5f781b196f9b141196a5ce10f38b09bf740cd6
font_02_sfnt_off00013082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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