Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ea7da57465531f…

MALICIOUS

PDF

101.2 KB Created: 2021-09-04 07:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb46a3bbc6681bebe5019337491cdd86 SHA-1: 8c64c0cf57c1e2dc9c89ce80095083825f17baad SHA-256: 03ea7da57465531f599715ddf6a6fec9fa5d147e7fc72410d7f6508551ed941f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=whirlpool+range+owners+manual PDF link annotation
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/74463644501.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/15417296711.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a80947fe---libilelokubodibuvegozomox.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/39862775912.pdfIn PDF document text
    • http://sinoorchids.com/image/file/bobaginamomafomexil.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vikopuwimozujevomum.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/timafagi.pdfIn PDF document text
    • http://uchid.com/uploads/file/fogavopuvuzuxobov.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210621033503141.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4bfadc60---69711948071.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/68043717168.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892b5109cd7---jirotolupe.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/bigelikiludowixake.pdfIn PDF document text
    • http://merwepizza.com/upload/file/wemadumefibamiliwek.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4a092257---54252112424.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/75159400329.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d58bbff3c---85054164870.pdfIn PDF document text
    • https://5udua.com/contents//files/vadojakig.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vawenijew.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7e01c4e03a6e0986fc1a11fb7ff50424/27772468801.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n4mb1bdnclsuhpknepec76vtmd/gawafare.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/rikitibetekadilesosoko.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/duwirorokegiwidusaguba.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/60406095425.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_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 22056 bytes
SHA-256: 570e4e92335c5babd99a8378b34cae5dba95b45e7fecf6b4feb0cde6c2ad567d
font_02_sfnt_off00016e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E75 10780 bytes
SHA-256: 5472fb067af7fa695898a8515327dc5d9e6d197aea2b00b6ce8d5002bcffcc38

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