Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bf1587dd9914aa…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 14:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a872b9419764cd7ffb2eda6ffb1299b SHA-1: a06d82c20817ecafb710ccc2b6d2826f9d349814 SHA-256: 55bf1587dd9914aaacd9f1cb3cf5214f3dcb9a131c772402a8d92f913f4318cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The embedded JavaScript stream, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests malicious intent. The document body is unreadable, but the heuristics and URLs point to a lure for users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=iphone+sim+1+sim+2 PDF link annotation
    • https://milorem-service.ru/userfiles/file/nelijesulekotabobizuvere.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gixiragapamagisegibuzuf.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/70119905412.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/sitiwenirilik.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/vomoveneku.pdfIn PDF document text
    • http://kustari.net/userfiles/file/kafusi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/sosifozawetimipawa.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/93929964396.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/bijikupubeto.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/dakipupukimekizir.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vivugugumikebajufifaju.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7938a8e433b257fbaf480f5d4f2785d3/72653084531.pdfIn PDF document text
    • https://cian.hr/userfiles/file/lifute.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f214d22455---90923579923.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/gukat.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/72274282091.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f14e3df8---firujefilugutox.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/wifufapom.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/sowopulezuvugagemezub.pdfIn PDF document text
    • http://annabarons.lv/files/files/rugotalesiwerewivoruxejev.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/ledakisiruj.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/1621018859.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tafesobagoxumolupukunusip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10232 bytes
SHA-256: 23b7d26585c7c4f0bc2d06fbf1d80a05e30b6404f4725eff3e65d1bee0601868
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 25832 bytes
SHA-256: f9dd2fa71bb927b55d074cdc89ef70c57ef2ee251b769223d109dc94e3babc52
font_02_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001472c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472C 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583

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