Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa51c3e9bfc0329…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 20:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2df759835d168e01b5c197b19c3ab58a SHA-1: 41842a80fdc0e5bb8ff9084260f26bf254f51cbe SHA-256: 7aa51c3e9bfc0329aec46b9934d9b77882da396a33360e2b21882ac772664907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1055.012 Process Injection

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting it's designed to lure users to malicious sites. The PDF structure itself is also noted as a link farm, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=simple+past+present+perfect+exercises+pdf PDF link annotation
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/21775879265.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145acedd2eb5---22892390031.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/botezubatidugilipive.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidifivifitiradusav.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/88274175487.pdfIn PDF document text
    • https://korankertas.com/contents/files/valatexejufuzaduxakal.pdfIn PDF document text
    • http://viorina-deko.com/images/file/83243194358.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/59720207516.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/fixuduzewelotemulomuzeki.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/66575169009.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e88a870e---subolotadadakitavevunod.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/47459818008.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/55062450827.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/601937064.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/bomuru.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614700bb3dee9---55238339532.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gozubufazofukamupove.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/mivaposiwisajudatip.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/24594958651.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/konigaregagonifimuja.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021981756338040.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/37937994327.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/toxukomoneruvujusitome.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613df4062a343---54943408917.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/86292812097.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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17744 bytes
SHA-256: d7669e759c9029c09606247c61a37f04a67581b34e9402896fa529b2bddc57fd
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10836 bytes
SHA-256: 43568977035eb4090d025c27590396954e8f81e45d0e177ff43061b73eee9890
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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