Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6ee73f652f2ff8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 21:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc4e2b81aa6af44eee71888a5b0c33e5 SHA-1: 0cc041a2a14e789a661bb745010df32e99ad92db SHA-256: ef6ee73f652f2ff8b4ad668f10461467e5a30bdfc4e7314e2df6a6394134445b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on compromised CMS platforms suggests an attempt to obscure the ultimate destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d3d7fbba15ab2c9c9a7987662b64e0e4/26964818878.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/10715356171.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b946b0ee5---tudonuf.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f851c4a26c---40036345364.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fuperog.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/18380508174.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0q9afc2sv4hau3370jusutvinv/39509231207.pdfIn PDF document text
    • http://abc-tel.ru/data/File/95367875823.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf035dbbc6---tosafodobobofuweloxivimi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9ec29tsob2mbojh0unhbvqmfi0/26058382052.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/92369055237.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa867c72b3---salutoxig.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/28086295134.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fece947e6d312dadb457fa99cb22b70c/fezubebizoz.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/lebarokizifomipuzekabuwi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/20564889256.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/6896662385.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99eed7918---62544807431.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dnu2f7osk1u940ign04q2qolt0/galizogurugurazopowi.pdfIn PDF document text
    • http://schokobrunnen.com/idata/baleduvumanedopunuzabeb.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ev77itcu9qf7vb2ugkavd8itl8/97930741193.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/pisixemibebub.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a9bd4030---65536926403.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vimixiribuvasabuw.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d16464e1cc3be8210fe1f5bf1d67460/27939604119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=introduce+yourself+in+english+sample+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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 17608 bytes
SHA-256: 19a6985a27d5ffab86bb1f5fdde093f95e57ec3a77de834a16085a735fac7a37
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 11232 bytes
SHA-256: dea63eb8ac98531883e369b555cd68333211b93f2dea7b6bc8dced8a0b264876

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