Malicious PDF — malware analysis report

Static analysis result for SHA-256 09abb3e746371071…

MALICIOUS

PDF

81.6 KB Created: 2021-06-20 16:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bb0154d66aa6716cd36cfceea53a82a5 SHA-1: 72e25e435c13cefb0eaba092dadcd6442f4f96cd SHA-256: 09abb3e7463710712f28ec9155fd5273f5cac604f95e18dfc1d7e46d3f5d5825
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=download+mod+the+sims+4+mc+command+center PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/113618177f35e1ad7507da112581b008/solinorojugogefegizit.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160917860c9325---mevezapelarijadajovu.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/tisiz.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/90170244171.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b7a28eb0---wominovegososaxuwuzamov.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49cd8719c---1018323169.pdfIn PDF document text
    • http://camonetinternational.com/files/file/94015952227.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896bcddd2b5---2114810374.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/jomikibafinosojijalamaf.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/kaxuwuwovewutuvuxefuwosax.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/89269c65e367b9d37dff298fe1d361c4/83630676008.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e1a34ca6---talilitobalerixobibawi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0bb0102e---mirew.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed65cb1f95---69012783304.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba0ae5005---82953378368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 5360 bytes
SHA-256: 0d6cb5649cda2afcdb9dc05e6e50f87e282a135ae9535255e52b315da3479c9c
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 11008 bytes
SHA-256: 262b22e958604c106cc1911907f8367dbbb83cacefd86f03f14a095a1f37782d