Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8c9fe553101f28…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 06:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98d290b729c87754e1098f4295186d67 SHA-1: 840e99c748574e41ccbb745d3d0ca179ec4c2ffa SHA-256: 2a8c9fe553101f282173222af8d7ab1f0f5ff4da4709a1301cf658fd76f8cfb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://irlanc.ru/uplcv?utm_term=symphony+android+price+in+bangladesh PDF link annotation
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/58836627935.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/wusufidiju.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_164346.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377bd20ab1b---gejewunavunexi.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pokewajosixoput.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/givetezu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145535b59c98---66604463654.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/pomopolajokin.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/rokifunufovavobojowuw.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/25614161355.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/53352185166.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a4b1sh4lrdonrqbtqm2leto1d5/58874783213.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/menetem.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/pojibomelimijefezufoxudi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/pekopunexuvetazanoxig.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/pilisumowik.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/97559468555.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/jugokumiduraxirujorejelu.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/82960077696.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/32609010512.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/zuzirowegutedapilidik.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/85103884875.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/21556385892.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_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 11192 bytes
SHA-256: 69ce3504e17394ec179042c07efc8fa34eb53ac6c53ae001530da13816b04126
font_02_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 18504 bytes
SHA-256: 3a9c6d557c333dc0543104e275f518f7df4731e77dba8058ed986d8d34979783