Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b91ed02c7b3cfc5…

MALICIOUS

PDF

112.4 KB Created: 2021-06-29 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a861258689c39897207f939945c34872 SHA-1: 65a75313146444f5016222a0999c26541813da26 SHA-256: 7b91ed02c7b3cfc5a4864cfd65ff344a4b73f4c088a54899753d15d830bd0d50
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This behavior suggests an attempt to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/drlbeb1b9hb1tt8eh15kkvc3v3/namifujikas.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/v1bud8bktco10lbh6kol7am22a/41854017653.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae8fe331dba---73125632406.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c7e5efb7---namuxekowidewel.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c062a55bd6---xekofigekokewufifi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//705808232.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3908596ab1e9fb8d9df3f0a02a0630d8/88400107061.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96abe8d751---80875582744.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b44696b7e36cc4c59b2f13e695334ec8/71933800320.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/71e9fb37d3122a213663316473d2a08a/57202719250.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858dfaa5bf---56770150756.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a3fc29c7206eaebc779a691221bea13/kotegutin.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/97560185131.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/miloxixopitopogex.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e975baf6dc---18125235923.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb351bcd7---5189300638.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3ab81710d0c5a4aa2326a7e18aa43174/61883061044.pdfIn PDF document text
    • http://hodori247.com/uploads/files/dumekevonabowepadakug.pdfIn PDF document text
    • https://superpart.com/files/rolake.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wuzovule.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a2e6094dd6207a4ea27fe0312a051e88/kazatuzulip.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a1177139---negasi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52abea1d4---lojosebag.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/67432519066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mini+pinscher+and+poodle+mixPDF 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_off00015526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3D 10776 bytes
SHA-256: d9c42709447ab5e4a39ce184e236f9e82be2922fbcf31cbab33ec9376f42ff2e
font_02_sfnt_off000185c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C4 17956 bytes
SHA-256: a474e813a39c3123c3f2bceff642222ba8be5145ca3a377786965f1529936437