Malicious PDF — malware analysis report

Static analysis result for SHA-256 145b006ad3960d7b…

MALICIOUS

PDF

81.8 KB Created: 2021-10-07 00:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc543d5dbab182e510570af6a7adb1ef SHA-1: 3abc50b0cc3ec82955a5d467b7434e4c574ae82b SHA-256: 145b006ad3960d7b85f6fc8b550994a32e4ff767e85a350f56e5f6f07bf8f8e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://numen-wow.com/userfiles/cloud/files/lanesinafuzugobopa.pdf In PDF document text
    • http://lnshiyue.com/userfiles/file/20210926230839_561573378.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/50129899064.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614348c225ee1---jelimilebivu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158ca6997df1---74506081261.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/bijerijijabuvi.pdfIn PDF document text
    • http://rentaruedas.com/files/others/76676424385.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/29355125773.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/87636414119.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/72895320278.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/tibudu.pdfIn PDF document text
    • https://robodom.si/files_vsebine/tupisivifakirikutuwaro.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/gajotikugegifizuporabega.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/punaxirofuxinawuku.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5e73f4f63a5d399002fe7b1bf2ffae01/89599794708.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d25346e14e1970b96b67a8314c456a9/66800434781.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0a55e925---rugezesuzi.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/zijozokanixaxetun.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/xebuvijapix.pdfIn PDF document text
    • http://inphilong.com/upload/files/lisuvidewuwepi.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/56022329319.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/7076983129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chemical+exfoliation+letters+abbrPDF 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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 21076 bytes
SHA-256: fefc6e31b1ea2cfaabfffa414462ab026e7f1e06fc7d6832a5df05ba1dceb727
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 10876 bytes
SHA-256: e127b69a9c72ba857dc004f0ed2bd86e5779ae061c237e420b978bbfc7d3e257
font_02_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1