Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc152e453fd150ee…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 05:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a84ccb6496722d2bdcb6b17e47afcf SHA-1: c8271c1725f75015a8405969484df03092ad6ccf SHA-256: fc152e453fd150ee43bbe2d0f78442944679ce6d9b5341a4eda457cb07eaacb4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f53ac8abc---pomigoviwazek.pdf
    • http://falerisztika.hu/tmp/27412415605.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079bece44b74---zuziremovu.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce47185374c---powajatixowisifip.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/88689f529f01add33d1398d2acccfc6d/poseselogawu.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/004ceec583801f18abd263262e7eb012/27261184114.pdf
    • http://villalapinetafavignana.it/userfiles/files/50761781313.pdf
    • https://iamtimeshare.com/userfiles/file/veturukovowej.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061522435480554.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b332a53be7---dujuvusepat.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/baresepej.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea033e852---rovojusukejevo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52868e2af7---23801153323.pdf
    • http://amsaneeraus.fi/userfiles/files/22480508718.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1dd4a2a9ad98d482e879a7140b7eca1e/17873960321.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c982ab15b8---kotenivokageboveru.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c2f400100a60743252f51b8c71529a8f/jigokikifipixubinomudi.pdf
    • http://wecans.net/_UploadFile/Images/file/xubofebetusifodaj.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/31446610094.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7c1c97b6---kulusedofaloze.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9f1ec9c260a97741d585fe0f5196b66e/xamivugive.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4d246e62---27726081438.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=scripture+there+is+a+time+for+everything
    • 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://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_off0000e77f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 16792 bytes
font_01_sfnt_off0000ff91.bin
2a41996c2b2dac3b219575ddc2015f99d7a841c603454f941dff790925b1fa73
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16888 bytes
font_02_sfnt_off00012b0b.bin
a95234eba10bee32de4338ee1be4ff6881c6c6fabb7c03bf39d67f896b2df2b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 11236 bytes