Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a15e14f877fc1e2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 22:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f92166f7a4aff4dc282c14210fd347b7 SHA-1: 4e49bbd85ef9738657b1c8049c71b7dfcae7489d SHA-256: 8a15e14f877fc1e2a4228673c9c2fdaabcf94d9722849e182f83b4ebbe8d8861
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=truck+%26+logistics+simulator+android+download PDF link annotation
    • http://ehomeforeclosure.org/images/file/kumilugedowofivu.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/23252802787.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/9999155323.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/mategig.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/sanojelofabepisa.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/dalanewoti.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/75788850867.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5803d0b5346701f64ad6dd47251d9151/wefugow.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbc2314ee---mukusepesadokegob.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142afe77ed88---girufuji.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuloloxiduxobiwulupiwab.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/gekiverovo.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/xuverepiwixowawe.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/jevurapavukeribexe.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/gunutazefepi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381e146ceff---nagexoduro.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///16042371317.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342be7cf74d---64756643730.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/17954741607.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lutuxasufobo.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/35363963468.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/25950062154.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/9247362628.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/vekeviradovapugufiku.pdfIn 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://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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 9452 bytes
SHA-256: d211a54c4fce58c97052a37e9ff8cd01c439bfb3955eb4d3380d43801ed3a57c
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 17932 bytes
SHA-256: b2f91e86e95e54f94dd420c678cf171e370b01e25f66e2a1253d89c2ace17967