Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dccd3ca0a000114…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 03:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 191e707c16a9953cd9c112611aaa6abc SHA-1: 5c75809ffbdbc13adad19ee04796a551d4b071de SHA-256: 1dccd3ca0a0001145229ba70f9e025078b5527373ac5c04994fb316a241e1507
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=how+to+delete+pages+in+foxit+phantompdf PDF link annotation
    • https://notrepanierbio.ch/userfiles/file/lawifevidosedulizawuzev.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799fa81e69b---xikowegires.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/20546bd04793f80a7df8895c9529dd8f/kesene.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/70762494632.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/61592121937.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/66524569140.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d47f99d0f---kezifotikevimotorotasi.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/gixuratewupa.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/pigiduzat.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301a6e96ea7---mikuwujawozonamexotopur.pdfIn PDF document text
    • https://mlspoland.co/files/file/kodawivonofegonidovibafok.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/69902256518.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/64673616256.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/13966432427.pdfIn PDF document text
    • http://clingac.com/d/files/9056911005.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/36474238575.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9f9d3c6c---xenizajajevowubuzaku.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/56607808806.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/kbh1ggkjgkpngl3gkjc6rjii16/69435264840.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gaxopi.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/15019250949.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/89k1be0gu0c4gp4uosf6ots418/rawarogubu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2shcm4khat87k281kov8ro3vse/79787815215.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4339173bc33917614e0d6c08e458b2e1/93635397955.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/97761356610.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f9be244336a---73737148185.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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 17872 bytes
SHA-256: 2c5e799fb0d92f666f6a0d213ed00d8c2c671aff7e959f5ab125bc98ba04cfca
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 11024 bytes
SHA-256: 7544cce6cc608fdfa84bca2f8b79628022eff71c011f868581443d54027912d4

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