Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d3b65ae930c951…

MALICIOUS

PDF

98.9 KB Created: 2021-08-03 10:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3e25ba68fa0f3278cb0a992309d08388 SHA-1: 38f5945dc6f3d54f675a06d9c70b5e868f4a4911 SHA-256: e7d3b65ae930c95176757bc89c627bf8d12b5f51eec3d961add8b95a56665c4c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the primary purpose is to redirect users to potentially harmful websites, possibly as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://4998horo.gmmwireless.com/contents/files/wovanilebu.pdf In PDF document text
    • http://ottotech.center/userfiles/file/dokito.pdfIn PDF document text
    • http://cycling-software.com/files/file/xowomoxalegidogosopizekav.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609853dcba49a---96687958843.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/18471213733.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/19e93a575497ee320197a98a4b066fa6/29752191479.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d42333fb1---vaturetegofixefupubefof.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8311bf7bdbee8dcc1270e330eda9a0b4/nigigavixumo.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/36245974876.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/2ebjh3uclb29k7d8bh5lmden7g/53678074045.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d81769c5---genidivazegupatofigi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/746adf3ce93eb503eda8646da4486430/sonuzoxemivosobebogi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/11793670825.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/zurakijufugamu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/tn11ukfhidhvemo6puorv5lhko/63428102425.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/vimekajijazodozajamigem.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d59c62d200f---razadoxiborazujeredir.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/gazanivexekol.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/82917945894.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wazawoleb.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68e0e316c---fefunalogenox.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/sipipepa.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/bigibiwetexema.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160730149cc2d1---5707354676.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/wiludipirozelej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=i+itouch+air+watch+special+edition+manual+espa%C3%B1olPDF 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_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 11124 bytes
SHA-256: c5773ee757cd9c70c9b32e690402f7f74aeab5f8ed361d370b123eca6f673ec7
font_01_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 18732 bytes
SHA-256: 5a86457bca20758d4bb13cab7f872e7a77f6a4ef9bf108ec777ad75110aca172