Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0b52ce852eb95a…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 18:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0c17e5e7a14fee1281291c0e2fb0d5fe SHA-1: 5f05604fb1e93342777624817059f6e963dd57a2 SHA-256: fe0b52ce852eb95a8736fac867e4710d1390f784a6f1d1d0bb40762159359e6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. These linked PDFs are likely designed to further phishing attempts or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b21749a0d0b8d87aad3698fd7859b267/kedopo.pdf In PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/lavorojididunof.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/58094432051.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/418ed5d5b77d936e19e7df2157f90c9d/nifesamabaxoduxupajo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608770eff0ec4---78014599975.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6a591d99---lekobagivedu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1017b484a49024f61de47489ea66994a/5048295857.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/31159137905.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1c65127d131d26e4878701f43d7d9cc/74080417215.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/lev8p3n1krae7qkm9kv1f4jq6k/79428905127.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mhqqsqt5kvr0f4va86mbevrb5g/26961805483.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xewutinu.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/giwaxijugades.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959bb2e3ec---90795537028.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160769cbf764b6---67403950021.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/833a4kp1b6gq2rdk4d7laoghru/77854663983.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e01ddd4e---bakexigedizefazivuzelo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ca653285d5---vufunewubolodetuzalisava.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/676361273b777f08258345bb0c9297f6/nojovokeru.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/af4ea716e82d01024fbd04fad05eb4c3/66551126064.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/3d797274c9aba7b986e2367ee348cc63/576387536.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853749554c5---1435235617.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/87096115342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=public+management+assistant+exam+past+papers+in+tamil+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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 18160 bytes
SHA-256: db0f0ebf4763397e9b4ce52a95355727a366c5fb03cc3b5d68dd1f7c990d47bb
font_01_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 11188 bytes
SHA-256: f779dcc7b1b0c5e8d5f12e966db0d25101fd4522ff1dcc34ca4eb8b65e9b65ac