Malicious PDF — malware analysis report

Static analysis result for SHA-256 1338881753569d47…

MALICIOUS

PDF

93.2 KB Created: 2021-07-08 06:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ee7ec8b6316669bbc452db236640cbc SHA-1: 946fd1a35311b9d465c505e08ac91911a11a7789 SHA-256: 1338881753569d4714fb4e25d39b76832ce82bf4f281d2ebcedb76b8205a2f3f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/dj15vjd4vnsb23g6ovb7s8ec20/9299292721.pdf In PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/84077271971.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075fdec6464a---2233694230.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39e67de463---38150434358.pdfIn PDF document text
    • http://poiskvod.ru/images/file/58768927905.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6070a48830ad1534b1acc1c65d340542/zadijupede.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/h4egte3acphn1ulpqi2rhi8rit/ropaboguvirolutemonematel.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083434566794---59126071444.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jg20n18hvefiodnokmc0l73ppd/jakesizonugeromebomubovor.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239e8353a---molonudokik.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/261753056526.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/58592321664.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77cbc35d0---nojudogegejudimelanonofe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8822cd5efaa9c405ebc0ab69ab470a1b/42550218643.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35034676056.pdfIn PDF document text
    • https://aashianarealty.com/file/46685496217.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/xiwaje.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/32342729824.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/reditanokatewodupu.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/lutotobetakisala.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66810126599.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ece39b6e---bewiruwojodoligavate.pdfIn PDF document text
    • http://liyangah.com/Upload/file/foguvevarogitubor.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/vegorobonirefunozobupoxo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f756b63541---2117841820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=linear+models+in+statistics+rencher+solution+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 10692 bytes
SHA-256: 09c24dee126c8d3ef2bcf261c22a7712f32d225909da56aec3a93ad6a4018a58
font_03_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 17444 bytes
SHA-256: c0f4cd9ba8e15365003a16bebec4c1d6c6e97bf640950b605f8b76ab8a673254
font_04_sfnt_off00014d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 16592 bytes
SHA-256: fa1c929fa642cfcf0b0f43639b68849163276d5ac12b3a2745509c9e16db8afd

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