Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9a8f61020c62dc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 19:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd167bb19bc639ad1ff9181781618519 SHA-1: edb879792bb689a82e0f8700b7c7a13f490e1025 SHA-256: 1b9a8f61020c62dca34e976e5e43aeac8ec0ecde101aa0b7f744a41dbbc5f0d9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, aiming to redirect users. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hamzakocakoglu.com/userfiles/file/85783009918.pdf In PDF document text
    • https://thietkewebseo.com/webroot/img/files/mesezovamajivat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400402a59b8---xezuja.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/35531717726.pdfIn PDF document text
    • https://digireg.org/upload/87679379416.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/77062087655.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/15761718820.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/wonufilu.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/makiketegijotumewasotiw.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/48316143012.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16319428698275455ae3eaa2c291ee.pdfIn PDF document text
    • http://greenld.com/userfiles/jisukunemurijeje.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd247f298b---wulizewowa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613468ec903c8---sawuva.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/mapuleruborazesabu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/861dc30da4114ae5519e8d90a24b79fd/20061217976.pdfIn PDF document text
    • http://akademibt.com/resimler/files/30358777477.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/35701675346.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/69685135074.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/nuwofumovukubatelapa.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/nesakanozusinuruji.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/lixufu.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/rebeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=facebook+all+version+apkPDF 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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 10544 bytes
SHA-256: dc1b458d0000f2dfdd9e02c2a2f87f4e829be98c6ad836e35483cbfe18d5b511
font_01_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 18492 bytes
SHA-256: 24a74e3f28edf1d0d877c5d5dccc91a5d6f42baf66048b5039b5acf8ec023e09
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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