Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef174e8c4e5500d…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 12:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 39fdbb33170d8942fee5ca5f77d623b4 SHA-1: a07305efd29057bee34a72f1c8ed9cf5269283f6 SHA-256: 7ef174e8c4e5500d5f3deae63d954a653d06c84b103d7e63384a2dc6383cda08
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. These links are likely intended to lure users into downloading further malicious content or to engage in phishing activities. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e0e598f5---xapuzavutaruxisugor.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ovb757nc8u5392qqju96ie7o6/sakavotumifisomivazijifob.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/gudaxujuvesukagifosep.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/96444419870.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160769b3d190e1---13343805499.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7008a3e74cb9cd4e1a67c979497b24d5/78554743778.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/580d84bc1c98110ed5a66587c09a84ab/14577890518.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/wewotomoti.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9boskn58remmpkfefia069tho1/fofapawapijavi.pdfIn PDF document text
    • https://pcetravel.com/files/file/73276848254.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880429adf30---nogurukasuwasinabilifuz.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2174ea34---wezamagodosoloviruvoribul.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/zujemakus.pdfIn PDF document text
    • https://digireg.at/upload/65560761516.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/98263718320.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d122258cfa---25155698274.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892ea08180a---vedemazaneverepagadi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ocsh66gcs2gdvqg510q60dc3e6/niwixilikowuzepisu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/66723494849.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/19179035072.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/75642104831.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9234d4efc3acef71bc2480b614335eca/28981681106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tnpsc+agricultural+officer+exam+syllabus+pdfPDF link annotation
    • 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_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 11384 bytes
SHA-256: f9ffd4f67fcf8fb489eb60dd371c43934376d101a99ff385b82b1be17a883a1e
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 16688 bytes
SHA-256: d205317a6e1c889f3320876a323c7a81cca8543b05c7e23adafa0a70fb21d48a

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