Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a48021b452af89b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 03:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f469ed2d82939740ff3bc160e688c8e7 SHA-1: 9b51a03078c8fb89bd9488a68cf3c3d9786c8ba8 SHA-256: 9a48021b452af89b372c3fd8cf0d95a1f9a76bafdfdd6cadd701383e47279a2a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure as a link farm suggests it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kxnjl.com/userfiles/files/jatavoj.pdf In PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/g095s93um68bh329hkugogcnpc/gafenexenalabewuwifofisaj.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/jaxuwedubalakibovopadonal.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/56g5b04u0iqorrc4l5beibchl1/vixif.pdfIn PDF document text
    • http://grotech.in/userfiles/file/94951753707.pdfIn PDF document text
    • http://esistore.de/userfiles/file/83838405387.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/rizowapudipodepa.pdfIn PDF document text
    • http://gtshotel.it/images/file/letigana.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d0d99883e15c79f2f35c36d47d8ff67c/linezifuxesopuniz.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210531_0548139BA886DCC8.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/36772678535.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/20998429137.pdfIn PDF document text
    • https://promise-land.com/upload/file/54173485890.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354efbbb013---rosisapifilijokulowa.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/12119619363.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1079576000.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/96774169471.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a5cba96f6b7bdde7bd63563d0c1e8951/61972854897.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778da25f2c0---61061913668.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/zokivexur.pdfIn PDF document text
    • https://dcimx.com/files/jebepukazumumomeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vintage+guitar+price+guide+2017+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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 17800 bytes
SHA-256: 87cd277eae96d700b2b1f758266cd2aafb8ffde4dc4528d733e13e888988b8e2
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10872 bytes
SHA-256: 79ad7932ea7769b827cfad0c9580b40e27296722c67fbdda26a0cb9138af747e
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1