Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b64e320f8820ab…

MALICIOUS

PDF

81.7 KB Created: 2021-08-25 01:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8bf3edfe1fa018925d1c05c57b881d22 SHA-1: f2f6ce44c96f0725bb0552b94b0d005157688f47 SHA-256: 87b64e320f8820ab27997366cd8a29916d8a5f917416d0a7092046d50ff03ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=you+were+too+late PDF link annotation
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/78bc0c2e3b10b6bdadbee3f7bb99f25a/29804226169.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772dd24ca7a---91214644480.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3f8f7c1271f7adbe7e7c04c36ff33910/gadujuwanopo.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/lidavekuritokovefuxuniro.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fbb964974e49cf081fd1c654704c8a15/53638138100.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/9037494310.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612056e70babd---gupes.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/42883063453.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/99274143659068f4cefa072068754432/kitisabufosoxa.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb66280685e---xesakevodobig.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/dq94e3ca6471u2p0p6sh29q0qo/8017112664.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0d956c86bd---naxuvelo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/20749358099.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210825065056.pdfIn PDF document text
    • http://matras-devison.com/upload/file/fizokisigul.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/be29d9f44a7e36095bb69cd59e1ec642/63426251533.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///tidudagezosubaxa.pdfIn PDF document text
    • http://clingac.es/d/files/robitimode.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/17627753792.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/95549728723.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bc342a7cc05ddb2e3eb6e3b80e50b531/33006095167.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/c8059e5ed89c6e8162216250912bb813/zepobaxebotudujipovuz.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jazule.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d26e2d38822caec687862d4fee844b4a/36408351019.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/febuximavojosepitafonefod.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/06880bc3d658141c26aa68a3b4608d4a/lusatojinapumezisor.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/52097028366.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 9904 bytes
SHA-256: b9f4204eb02c21c2ddb416653e011ec2df3cd385a567044f5bf765746d46da42
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16672 bytes
SHA-256: 41f9d45f63362c9df385042487b28484fa0fa926af5e611e5972b74a4a05d58f
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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