Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d5ca296e40c003…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 11:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 440bd00dbdc73adb0d24f03776c769bf SHA-1: 9b9ad6ff039718b74ef26203c65b45e683371eb7 SHA-256: f1d5ca296e40c00326ddb6ea328e2ac343fe6fde5a0d34458a681d342fbb8d7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, designed to lure users into downloading further malicious content. The presence of a download button lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/wipawa.pdf In PDF document text
    • http://yourtruck.be/upload/ckeditor/file/filubariwo.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/52978761187.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/nezogufijatidovujinawavod.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/busubujuzosevetitusomevig.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bijasitemasumutokugoxep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a145d4aa58---wafefamuwezebemo.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/57536918053.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/gawelaxope.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/4812351111.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/nexisumiva.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/dofibuvisez.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/borefiniwoxapumefi.pdfIn PDF document text
    • https://combrooncom.com/contents/files/guxaponozak.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139df686615d---suvexibaxusu.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/63216375110.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401ad296aab---jopujonejagiwupajedetol.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/60313186251.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210906105801.pdfIn PDF document text
    • http://it-hair.com/userfiles/novufepunenobeguxosim.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/52176767513.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8e138533---vexixi.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/21855497681.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091409354673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=delicious+emily+wonder+wedding+free+download+full+version+androidPDF 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_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 17500 bytes
SHA-256: d702ebfd7910a0a5c5ff855a57f0ea589a23dffc46074d3aa2bda9af58353122
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 11088 bytes
SHA-256: 1f010ea7f3a4c2f9ab3acf518c6ee679427aadef049e16dd3de1b84fdfe5f02a
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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