Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d055a08760bd917…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 01:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00b9517cec602f93f4d6ecbbdcf069d7 SHA-1: 29a5ed3d726ba05259bce682dbf7fa70de3a032e SHA-256: 8d055a08760bd9171c48c274ee365f6e2b4731dcea48da567e79037b1acc5c75
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external URIs, many hosted on compromised CMS platforms, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/juvolotozalisojes.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c2c2632553751ea13a6ad50de8f1635/tijom.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202108190558567658.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/168tv95m64pbnt3aagn3elh020/zosefidikalolexodinadasa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ba71cbd7---luzap.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1e899430---fevawovenipume.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/mezim.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/57984268155.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/17509412864.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/refukuguxifufemo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f11fd2618d---dokuziruluxiveximizoveze.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d10b85ea8---zalutojunazaw.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xijozinaniguk.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/bewavategubazenibivuf.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/9918089983.pdfIn PDF document text
    • http://topas.lt/userfiles/file/gabozaw.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/80139894235.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/21944780290.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/0656a8c17c8d4a0c55f93f53e7c8fa04/39656527230.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/23742274750.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160913756d7235---99915216234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ceb+numerical+reasoning+test+answers+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 19808 bytes
SHA-256: ba7af5b5ed1b172da509fe3527a54ad0da4f29a1a8dcb8af6b19a55a9fede79a
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 11320 bytes
SHA-256: 94b613ba1ac89886e5970cfe1ee279b24a60612bb7e77f73f09524cf9749ff71
font_02_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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