Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fb9671afc1f428…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 07:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0f5e6be7f5d8a8907602ab1d83fcfaf SHA-1: a8878ab78cbc63287a8c4abae41e9cb0cbd6b256 SHA-256: e1fb9671afc1f428b273212ef52c164231584ca3415e62fe83780a37c2356672
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/mujosozelabi.pdf In PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/47150755021.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfb81abcf---40130032919.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac6a5688b---51152635048.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/86984419971.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0836a0df3ba7acade91bc2452ead95ac/64362040196.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/77127257436.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/bopunufabebuwo.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/pufoziwime.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/lebidovit.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cbdc9efa77074824ee804b9ef87ea413/89931482388.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/2726041729.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d3a7d5d5---telifadawak.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/53657242317.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bn3l2tov91mst8a84gbilr5pf1/jevenefanuvosan.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/62692098411.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/14721132735.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/51284580476.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/fuvigul.pdfIn PDF document text
    • https://datawire.gr/files/files/debanefoxikon.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/42398725000.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/kulifotixebamozunedade.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/xatogofidirezidadokutivam.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/15702032709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=calibration+of+burette+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10596 bytes
SHA-256: 246ffd868c01177323212fe00fdd7428c55a65440ac23c36429a609131167280
font_01_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 17556 bytes
SHA-256: 13d3f447dacc79f0a564a38f881686d14d1de81bc25b056bf3fff20cfbd48b3e
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1