Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e9bddd29422859…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 16:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba125ab67ebdf1285203f9f483d7875d SHA-1: 7e8ca8056ada888c100f502c335cfdee614d2539 SHA-256: d1e9bddd29422859a497dc4a978cc667637d2e0d1dc4a5faf55a6f81e5bc07d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The presence of embedded URLs further supports the attack pattern of directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfded0162c---pedazuzezowizokazek.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099e320e2f5f---59354028892.pdf
    • http://viprealestatebrokers.com/userfiles/files/dagaderumajumo.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/03tp8p6p74ir417l3tm6plesdj/47633014331.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764afe7839b---60986689538.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8652897fdf36157805302ea2f62274d5/lesedarapufezu.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ac2e511e---55791616197.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878d7470813---bawabigipetoribisozupitu.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/901e2fc05cff0222455b3b28b7ad5eae/jewozina.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0bbd7df3aef493d2c5da67621f35e73c/64550009769.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c66eb5f41c8---97054510180.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad7fb7ae1---27415893764.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/pl46v24gb7n463sr37ol47vl0o/4878838715.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6008535fb83b45d31acf7692c8eeca01/mijinerulukimesosuwi.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c444d2c1f0e---kunujupobefiloxelipo.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/35642137739.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=10+weeks+after+hysterectomy
    • 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_off0000f5c2.bin
b6fe58b9812655743bff1f83450dad1099a419c2d5367e9b213d90943b2411f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 16944 bytes
font_01_sfnt_off000121dc.bin
7d77b914748ef08f719f09dff39d652a68e892bb995d5b533c1bb64ee315c6dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10728 bytes
font_02_sfnt_off00013abc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 16792 bytes