Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e427c8924d73916…

MALICIOUS

PDF

84.5 KB Created: 2021-07-08 19:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab47b4da9482500c8381139ca5405d4a SHA-1: afde18026c07b098188ae5d5583ea680ce0025fc SHA-256: 0e427c8924d73916c504e2afb135b4cbce2d27a9abdb7eabdd9d6ac47249b204
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The PDF contains numerous embedded URLs that likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://jkmdc.com/aversystem.com/userfiles/file/vufezakid.pdf In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/18d7cc0a4601194e45289bd5f690be8a/69613953753.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/futisamuxezosin.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/fafekubozib.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942546b232d---89159447062.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vom973u809akect1p3rhpc7qmf/37449118944.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/216e3cbd9560be35a695706558edb360/76020094120.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/51898506390.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d3673d8402f856970bd6a96537b7d63d/vosifovatepomitopi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/567c88094ac93279c43475cd9994e2ef/lasazebuvugisexinubefepu.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/3637724669.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b84crnmndnvvbrv4dtissl8sn7/jofuxesalusepabakeg.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/pigalibedexumazodini.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/70546308994.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/006cbd891973c82367954ca2edb6889d/38915299294.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b75cb7844ea8801b576afed231c67068/relas.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/62115031858.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160867facaf9f9---vanube.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0e752aff---zakokugotowagami.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaf152dea2---67438166705.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0550873a3f---89423880221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=do+you+think+you+love+mePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59894600342.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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 17184 bytes
SHA-256: abbf8b26a07cfb926b8bc067909666668dafc8bde88345a2d6a6cbd3a227a2a0
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 10316 bytes
SHA-256: 833989e41e03a967f1ead2aa03bddd8104bc06be05b76fdec3947b3717cc33e3

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