Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9643ca2a58ce128…

MALICIOUS

PDF

83.0 KB Created: 2021-08-31 23:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c682ff3877ca38bc4c19acb65c36537c SHA-1: 0c3ab6fb71f3f8d8fae933fd02d16934e2866d78 SHA-256: a9643ca2a58ce128a370f42fb9b0cce08bd627261c04716e3c34f7a6d9e0e889
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to PDF files hosted on compromised websites. The presence of multiple links to potentially malicious content suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://phuquiland.com/upload/files/vilazunibafuxejuzul.pdf In PDF document text
    • https://yellowstonewildlife.com/gakejelekog.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/49812916911.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0e232b48---mebisapakunepufofu.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xajiluvelemabuze.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d9fec7d8e1a6ee744ff97f19367f390/vazop.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/13357243468.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/72048973284.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88499e2c6---63875882737.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848aae85920---redur.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/95158761867.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608148b89d7f3---gixugiveduwofeguzujob.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/maletalija.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d99e48148cfbe88d2d1348058e1b3b43/risuzano.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/pugutijutuvos.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/14c13c0e42206b63d54a7706c3cb29af/wadilow.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f2d4f46f---76422364625.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/obt7ks1ntki8gs40ubp4btnq7f/dozoxexesoniwilesure.pdfIn PDF document text
    • http://livestocktool.com/d/files/91205417152.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/96509520637.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2faf05a4f---banizitolag.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/nawamawilitaxufuwibojoda.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b9d810bd3c3e9f8b6c156365831ecbe1/97150451257.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1212b4cc9a9131409026a7f69320658e/62370485090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=simple+entity+relationship+diagramPDF 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_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 17712 bytes
SHA-256: 8dd2b44ed0644cd209ca0206d319eb8c84e6078ba0d69bbd8ec3e42e221fc560
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 11028 bytes
SHA-256: d62557385df5b313eeb51f7047d3f8b624c50b50077582462c960f3699d1abbf

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