Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95504ee6d7fba73…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 18:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc02b1e27d6ee3a927887a620f0f624f SHA-1: 1568fb25d171c155079d22ca8208e689a23e6164 SHA-256: e95504ee6d7fba7300243e1e2c9bf9883d13b50d22ec3e76056e6f8ea7868880
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is often used to execute malicious code or redirect users. The numerous external links, many pointing to compromised CMS upload directories, indicate a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://synerhu.ru/uplcv?utm_term=general+knowledge+quiz+for+10+year+olds+with+answers+pdf PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d451e2818---lapuzojasijojekapate.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03852d602---wivarofexugosurozip.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/nerumigarokamutona.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/fefozeg.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4ottsn6dtmc618cjd3a9ua7vgr/matamuroruruxuxad.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/desedaxerixa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-25/20210825040416309919.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2b57d4d7---xikizimejowese.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33029a1201---nebuzowegofimasugemozaxa.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/bapuxizeroketidabajipazot.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/dasexuxegedoset.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b76606340fd4451c79083eb8e69f1c90/rejabagidanumajilej.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/3443496121.pdfIn PDF document text
    • https://taperagi.com/contents/files/43935224413.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e21e06bb7---33307253503.pdfIn PDF document text
    • http://vce34.ru/attachments/file/demikorobutog.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5f91c463ff099794593c8f7627caaa69/wikoterukabapesef.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ee79a83c---kajenomanagomamubizotil.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/bomatuwupekuvexuf.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3908494094---duvejojinibobepevalasaka.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/28193950256.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/voxozeligerebuzozeno.pdfIn PDF document text
    • https://airxps.com/userfiles/files/81815832381.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083449d4569a---24317097204.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823c83b8a95---varurizexug.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/58098544093.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_off0000cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 11588 bytes
SHA-256: 8173ebacc5cae2a64539f935f282e1c4b6942258bb23233d033cf6e3f294cc3b
font_01_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 17208 bytes
SHA-256: 5edb1fea7c1daf7ff1a65e805bf74c0aef820dd881b01581485147d5918a8677

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