Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f39ce15332be8e…

MALICIOUS

PDF

82.0 KB Created: 2021-08-31 08:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4117b73beac67234f8a3ecafb9ff3210 SHA-1: 48b250b4de568299cc2a6d6db9f3aa140fd9b9b8 SHA-256: b7f39ce15332be8ec4b76a507974bcf7b477d754c4abf97a1f1307a6dae8e87e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on various domains. The presence of external URIs and links to compromised CMS upload storage suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/uplcv?utm_term=jesus+making+water+into+wine PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/33394708777.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/27b8pdqgc2vvg7ifm4q75mv3vl/11800746715.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160810a9cf300e---zuliva.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/gejelopowevulibu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/59541e95896403c3fa75dda3a61f66d0/bidivamadiju.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c650f7859a9a9d36190c4ca963c5e514/loxogofivujitowokikazi.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/jalivinenuxokezewo.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/gevaromafuditopolukivinu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b41274a5e2---3379974671.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/7afb5c3cdad384f6c295b64c261fdbc2/79870912701.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4cab20788---61758477724.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/fepavuzuge.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/gikojizovidexe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b8e0f19071a1da398ebc49ea8d2d01bd/leziwan.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978e9632f2d---54436266420.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/vewubefoforozifiwezixo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e778dfec---kawobosuvufibo.pdfIn PDF document text
    • http://zzquansu.cn/d/files/43373689619.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mowaz.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc9561b104---derowiramukixujiruzak.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hsj0nq2p7gcu0qb3beec49bod2/katokilazowi.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kaxisudaloz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/46c3e8402c05b38e86079eda77edee46/zinibi.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/feropexigokamalugonafev.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 10676 bytes
SHA-256: 638ef20d83b2431a76f902d9cf1c9b6871fe02d682788a73413e98960e60bbe0
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17192 bytes
SHA-256: e34e2f93e59a7e26c838b73800e089c947886282ff65705210148ba2e3132e77
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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