Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e99c1d9415ee2e3…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 18:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4da906755dc8478c77fa1162a874de31 SHA-1: 43076c663093cf865f705184579ca6b19373918d SHA-256: 5e99c1d9415ee2e34893499b43ace57c1268da4d001acd9c55af466efd895ac1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, which in turn host other PDF files. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content through deceptive means. The document body was unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nrgi8mvkjubehofpdm381hssj1/90084601923.pdf
    • http://duhochmis.com/files/uploaded/files/nokosirawedul.pdf
    • http://batiment-tunisie.com/userfiles/file/narutijawibaliba.pdf
    • http://podiummoda.ru/userfiles/file/53393306475.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/84e78d943d87d1253586258b06b2e3f3/97731791909.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759c880a032---vezogililuxosama.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15d1a34a9---85647577682.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d264d60139864abb34443b392bc61b49/51304965053.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sdgcnk2ieaov021ta25smcls4a/8238113260.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/65r2d56rkqhttocn5osmkmgv03/sagelabokamobitorinosezat.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a18d8bebe---tavakid.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/78cd7735586412e6ed83a65ae3a0abab/tebipoborimovefoxesepolax.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c400373ff6---60455248475.pdf
    • https://hkbca.org/UploadFiles/file/20210526170353190.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ee7afd0c---74685025283.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca9ed3b2e---tosumezo.pdf
    • http://toonesk.com/upload/88592105219.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d7a51096a92125a419fa67c52eee2d94/25196564187.pdf
    • http://cortabellanews.com/userimages/65008029038.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vl3mn4k8m7g14ici31roc67ec9/juzoxojotelubisutela.pdf
    • https://cabsfromheathrow.com/userfiles/file/71785258925.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e871b5c7fe5ffd0a64390e01c657cac3/dukomomegusiwimex.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/67353137233.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+sensualist+by+ruskin+bond
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes
font_01_sfnt_off0001067c.bin
454010491eed4b90ddb9d2c39d9f999a8f45b9096c080042d2c6ae1fe0452293
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 17628 bytes
font_02_sfnt_off0001215e.bin
f7b293c8f75c849af725765a83df5cad3a39948c76a9b556b153f4d5ad6f58bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 10756 bytes
font_03_sfnt_off00013a0d.bin
f9fb89351c8e0d37d5fa69f4df399fac78607d6ba007554494e59dd38609267b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 16692 bytes