Malicious PDF — malware analysis report

Static analysis result for SHA-256 4714fb4e1978b5d3…

MALICIOUS

PDF

93.2 KB Created: 2021-09-11 00:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86b27d12cc842018e4b70fa362bcf4c7 SHA-1: 1f54f423fd7f62c324fbf8aabcddf50bed7dcd4d SHA-256: 4714fb4e1978b5d3369dd3b5e13ffa7fa49a887c1be96a0e3ad5e0c953b56fac
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The document's content, though heavily obfuscated in the provided excerpt, is strongly indicated by the 'SE_SECRET_RECOVERY_LURE' heuristic to be a social engineering attempt to trick users into revealing sensitive recovery information. The numerous external URLs, many hosted on compromised or disposable domains, likely serve as part of a link farm to further phishing or malware distribution efforts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://medvor.ru/uplcv?utm_term=add+root+certificate+to+android PDF link annotation
    • http://bimbrlata.cz/UserFiles/File/21053546110.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/walisamesuwolisomuvalo.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/35340297406.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/16730533046.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kulesa.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/735bc7616643b50ffbcd01a0c6a0ae71/pofavameponawop.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemifukaba.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/73448761639.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353e5df1aa8---20707675967.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/54451749530.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/30016226939.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/xasibujuguzas.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/norek.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/19145154533.pdfIn PDF document text
    • https://andrejc.si/files/file/mefonowik.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/lizalosimikotob.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/metotitizagesaxidakap.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9385ce10---furiregizatowosij.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/45644462234.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/mewokujaxe.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/15577440913.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/nerililemogajarixit.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/31621587670.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/xekanagofi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/nuwikoselu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/dipazabisogamijasowajefev.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_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 10236 bytes
SHA-256: 6f3565e2a5a56a00a81fa71c1df0e193fe80d23a4fba7001ac41500ce27ed737
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 17576 bytes
SHA-256: 519b142544c9d582ffa4ba357aacd1a3da8b4e6235bda32cc648471605f8560d

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