Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bec576fff7249e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 02:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2f134d0072e568f0853b49cc5d5b7f5 SHA-1: d6cee6642424d646df3ead1ffca4fcfe4cee4f68 SHA-256: 38bec576fff7249e54a315c46c438704ebe3727e2c0ef6ee1656c595aeaf5724
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=miragine+war+game+online PDF link annotation
    • https://ventadeterrenosurbanos.com/userfiles/file/finufuz.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/movofupin.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vadetufa.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/pubiwelinewasirekunu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/titesazu.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vigitotubejag.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/67462162972.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/tabeno.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/zedalofonotugufepo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wulasulaf.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/jetuzamosuliwexomepizasa.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/88245118505.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a3ad2b07646bc62e7f6f0a827d873c9c/baruzawutudafos.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kesef.pdfIn PDF document text
    • http://one9five.com/userfiles/files/nelosadobov.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613601a945d6b---55333045778.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zaxidudelatobi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/v4go0th1bbcgl4c32sishosi2o/49645919659.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/db8193e3331180c848be6c8fa39377af/gezik.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210909070050656.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/nezat.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 10264 bytes
SHA-256: 3fbf579e1432cfdcadb8a8937f860da251570f034f5a1dd1e40bf37c131dcecb
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 17844 bytes
SHA-256: 899987c100d5cfacb46c969eda7ae3a5908a55d50a2fba4c82e800e7c6d37972
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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