Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da789175b64ef8c…

MALICIOUS

PDF

79.7 KB Created: 2021-08-09 12:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ba49a52a77ae0a0d9f04a10f8de52802 SHA-1: 31aa0cd52df6def32230997e9ed44c4efe7b6fe0 SHA-256: 8da789175b64ef8ca17ba52c2474548b461d0ae3f0438fd98f402fb137a80b4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d5d9d2c31---tavumejemi.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/numezobizijogibet.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/dizasozibu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1056ea918---funadarirowe.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/fubedazudodez.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3d6804ecaa82f89a724e2082354a5662/8703321798.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/92123343463.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/15814845388.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/63457834308.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/96248745859.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6dc5d05fb024cabcf25ea0abb51d3c49/87125165015.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laxuxe.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/18288475334.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8b99d228e68337dc72d315e9238c7205/xigamutexipivewanak.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/5722734339.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/3484424826.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/23e168bb35fde3c6fcb1e973a576e0d6/3804953139.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/81075079170.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fc64c3c934339428f3d24503a541ff89/89057010399.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0b3c6bbe---tegoribigivakis.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb2f9067f5---29461122204.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be75d7b828---16495034414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=1983+yamaha+virago+service+manual+pdfPDF link annotation
    • 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 11752 bytes
SHA-256: fcfcb92fa4908de35bb763512c685b9f22aecf21bca0865368bc3bbffb8010fd
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 15716 bytes
SHA-256: 6ce76d249e7119aeab598b46e80371d4d0d40967a57b4332652160b16b4847d6
font_02_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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