Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50cfb96ba7cd9ed…

MALICIOUS

PDF

68.7 KB Created: 2021-09-18 02:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a80d52952133df12b5a68b81d48c63ce SHA-1: aa40db7b152d212c5babf9a1f4826b7366c8c900 SHA-256: f50cfb96ba7cd9ed0fc472a4feac25b234959fbcd5cb7058452890e9de720f4b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is an image-only PDF, a common lure technique to disguise malicious links. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://medvor.ru/uplcv?utm_term=shayari+on+chai PDF link annotation
    • http://thuonghieutoancau.vn/uploads/files/80188570694.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/62163810772.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/mibadunuzazenapun.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/62056268673.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/73150393181.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/rijasesupetiv.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/82290860966.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/75038773012.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/75039841387.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/61231174001.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kbp4jkasvs1ue3kfscg5hc8c21/wukizowizotonasotib.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sojokoxamunojufugijaf.pdfIn PDF document text
    • https://agros.net/uploads/file/98569721534.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/simelipaxizokejaliw.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xujewesufadedun.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210916032914634132ebg5f6.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/tujisirekagoweda.pdfIn PDF document text
    • http://airzo.net/userData/board/file/80577378361.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161371ecfb37c0---73128417963.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///jiminasada.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lijirodadavulozapomatesul.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/57801459876.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/k8prjcmbld2kjk2dakqnvkg7aq/1479448831.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/dowesowim.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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 10072 bytes
SHA-256: ac0dbf0945e6d43be7e627080dc0657ea90b9a5125e583fc352aac93c9014bf4
font_01_sfnt_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 14416 bytes
SHA-256: da8ab9afb2df778714e2c20efcc367c6e26c8dc8da5e08231b257f2121a1f1f8

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