Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce680ea30ed0f6a5…

MALICIOUS

PDF

89.8 KB Created: 2021-06-21 10:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9403eda18677608ac7d276d430c8317 SHA-1: 6a3630f32f7027676aa97550bbe77d554d4e06fa SHA-256: ce680ea30ed0f6a5a50e5a15e39fb856556f37596056115be394da04a617c568
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f3ab04e620aad77a8d3b1a2afeca19c4/mapipoxularasuren.pdf
    • https://batikatravels.com/userfiles/file/78711919118.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f39494a32b2de45a07c0563e42bf7123/65870488595.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9ea4f8d7---putisorepafakelewugalijub.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f09d43920cbbc71803d34e03bbabd802/sedafopupodumorexaj.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23e38501fdeeeb5a693d42ff67bd8ef7/99312196197.pdf
    • http://zgkimsteszew.pl/img/upload/files/xiwivadafixodefipibum.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1efc12943b---31029314256.pdf
    • http://geredekombiservisi.com/userfiles/file/dobiguxiw.pdf
    • https://activepymes.com/pub/file/folelulemilenopet.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/16fg6jcagbu4mdtgo7edqn5mct/60889974838.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab795cd2ceb---zupawojezatum.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7b7f21a284632de5b1cd151891928dfb/93651810811.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87b49a914---wotuvatuluwipiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=natrum+muriaticum+boericke
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b88.bin
573f2ac05293306c4beba50ab787cf21abbf94efa1ad9d3d649ea8c401be83c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 4908 bytes
font_01_sfnt_off00011c2e.bin
279f0d373a970855393ddb477ab903b9f0104371e7296b74f199d3fa0b84bff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 11496 bytes
font_02_sfnt_off0001434f.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 16204 bytes

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