Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5659bd59e4ac60…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 02:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6847a2dc37c84808571230c2d9a1964e SHA-1: f53ed65c3eb51ebf00e0864c070730149c6295ef SHA-256: 4e5659bd59e4ac60b40564935d4ad42411760251f77dd42ae2de0591026ee1fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting a potential distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://tckontrola.hr/files/manimolerusalosasavi.pdf In PDF document text
    • http://amoy-art.com/Upload/file/somiwe.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/95060039210.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/60051482214.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/dukive.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/fafuwavalidelakeno.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/miwupakefi.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/63728687779.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1ae01a9785ee998f8f20a5b05d19ddcf/dotisusamubinugozopizoleg.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0fade198f3ee6b064c9068560491cb88/velabiket.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70913e305---xidakuvi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e9df9a32468361a8d21afcfebcb6bcc3/jiwalogepot.pdfIn PDF document text
    • http://cichanski.com/Upload/file/54465800365.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xifoba.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///tugowedi.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/15600354032.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160775d85e32f3---31332846161.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b0b2d9c0---97509897123.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/36171925212.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087080bed12d---29353792164.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/23623279388.pdfIn PDF document text
    • http://info56.ru/userfiles/file/madavunodalu.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/webufokanujegise.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b96f71df40f29f673fb06f78234723c3/suwexeludodezow.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1396e402d4---47412153850.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/86540517848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=graphing+linear+equations+vocabulary+worksheet+answersPDF 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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 11436 bytes
SHA-256: 77a15e3a8110f733b0581dae88f68b3e15dc38d267c8ee3f57e91e20566d964d
font_02_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 16296 bytes
SHA-256: 472b6daceb456ec2cce5756a8450697d9913c20e2decf1d8a3d4cbae05733007

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