Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbb8d1b8b7b1319…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 09:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32facd0a63c324710a702ca5e4e6b8e2 SHA-1: dbdb2d2df959e36decc0d302ccde91f0c1ff7f43 SHA-256: 2fbb8d1b8b7b1319a69513aea9e8563eab5691fcbc7ee13dd8982fe146d0bc52
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ahnil.com/userData/board/file/xubumakokenuso.pdf In PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/kurikositanokoxibexuvejij.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612feea7b8c98---jafaturewefikaxizik.pdfIn PDF document text
    • http://air-ned.com/uploads/files/15852829254.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bec0827a---bexidilo.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/wasezesimidufewojewapup.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sitifegoseb.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/63211150295.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/45848770255.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2dc8935---10992850342.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/34536847844.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/11225523665.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/28530555817.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/tevisakikefoda.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/13181263191.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/pupapozazuzupapozamoseg.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/tivisukasifagejudukoxi.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/refunukagizob.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fokojozejavabuko.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/pisagelujokivorewetil.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/53998780824.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/zokoputusigazeborunu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/63476063156.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/14567263297.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/dajuvegarik.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gulekovibodosonaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=index+of+believe+season+1PDF 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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 10460 bytes
SHA-256: 75b7998844a2dbf25bf14e4e72cf2617bdb52544559a070206cc95b8b4657c90
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 18452 bytes
SHA-256: 4eed9f2da68836a06d06208a79dc96ebbdaf6fcaf0f9ecfe0f18c43f4c257493
font_02_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1