Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52e8859a94b6279…

MALICIOUS

PDF

71.4 KB Created: 2021-09-10 16:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd25d84e2de3c70d7e3c5b2c351e72b3 SHA-1: ca87de2876e0f2c3889f87c8cc6093e44d912fe7 SHA-256: e52e8859a94b62793893a653ec22f9dc4d4b8d2a52448dbe798a852b950f960c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=how+to+make+iphone+like+android PDF link annotation
    • http://fixafilm.se/userfiles/file/galafuvaxatinejorukufu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210907093633617212.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/54064496484.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/xaredo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/98141226697.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/dawesesivif.pdfIn PDF document text
    • https://sadex.pl/fck/file/zelazenowilebow.pdfIn PDF document text
    • http://zimmerei-possert.at/bugojuvo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134b91f4c6ef---38957046848.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/92595477388.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/23133865266.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/ludadonirezivorodidese.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/83955988922.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/53e4ceaaaca0b4cb3507ee90c217f7d2/fomoxadurogivo.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/papebajepan.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/235954755.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/jubivixuluforamanodek.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c37151b1---lonopuzuworofakazej.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/88568080270.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/86924886330.pdfIn PDF document text
    • http://jinyezi.cn/upload/16789084822.pdfIn PDF document text
    • http://iltorg.ru/upload/file/65016712107.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/taluzakeviragipotede.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368124684fa---79653951750.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_off0000b660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB660 10656 bytes
SHA-256: 89a556a9c825ba87fa442510f1b1ddc3aab4150c5996e34d239ac9c9ebfd19ab
font_01_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 16424 bytes
SHA-256: 10deb5791072a7c6f5268e8d7075c205e70325629672da2970aad338362166c6
font_02_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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