Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7b91190f201359…

MALICIOUS

PDF

81.0 KB Created: 2021-07-03 01:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b848053437f9df268b07e9696e711c3f SHA-1: adf0fb065efb70868f5d1e8322e7f2082b2d7552 SHA-256: 1d7b91190f2013598c718e19ece3b9344945caa17e6c5e910d8cb8c886c79ecf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or deliver a secondary payload. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files hosted on compromised sites is a significant indicator of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/75fsq26kd35u7ce9hmufgjqtd7/zamesuzanodabufumax.pdf In PDF document text
    • https://poolpoint.be/uploads/file/dopelatepiwumatin.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb365bec6c---27398174459.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63e262db---nolafulakewemazopufobu.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/fb646ca5245048a365772530e451d5f4/jaxonokebobunofuzeze.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/62618c454b24bc5a425265f2c76e7b8f/konagivabaku.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/020223485807.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ffbe62c51---5740328269.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/58gdd25rs9ftjhfk2s22f66ja3/89096720094.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c5ebafd2---75319602071.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/80461892636.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bb2266f1---wofovatulazemijawamutugox.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ddbb01ba---85197608552.pdfIn PDF document text
    • https://majubesar.info/contents//files/govudovizinila.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wiranupolaxon.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c6554a261149fd64ceb6f84478c6f40f/81049177307.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f83rpj1eo32m1h1390f2c2jd93/3587286851.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/o5bsda24mc88lems7e3h1ag528/24978288248.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4061c372bef2dad8837c730aaff5bdf0/xipesi.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/nuruvoze.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdecfad0842---witonamudigupojifiridazi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/derupo.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/96010442525.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/93883545623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=your+welcome+in+aslPDF 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://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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10460 bytes
SHA-256: 9999e508ed812b4e370524071e4d2456d7712c0490e6ea678091bab2cfac21f6
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 19132 bytes
SHA-256: ec8a18f4693a22ef4d9855531e56d6f750710a334f194fe211f8856b41644934

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