Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb71466af64cf3d1…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 08:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed0736f8c9de4f4ed6034574d2ff6d77 SHA-1: 715159158c766ed0cab35b755aadcd5aea8578a9 SHA-256: fb71466af64cf3d1dc3088243f9a3f06ba045f915bebc3b936b5bf8181156d6f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised websites and disposable domains, likely intended to trick users into downloading further malicious content. The presence of numerous external URIs and a link farm structure strongly suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://austria-ex.com/images/blog//file/65819047152.pdf In PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160703a562b636---84392502043.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608134bc6cba9---59591000194.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/lujubipuvobobiraw.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777f424c43---riniger.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/fiwupamazozedabag.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/bosabefubanuzo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c785e159897---rajixoxasararukibepiduda.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b81607e36f0e529fbe39f2cb3a772e5e/79304196677.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/ziresaxebitufu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c6f1f2d6---41517069511.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31bc8e274---kuvoganaduzavavup.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9256a310c8aeaa79c79708963a56ae54/bizefatusuduxawulobopapuv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c5a7eff---92578768543.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160879b5a7b35c---42425875618.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608624d1ca440---39906033132.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/binuzevewavivopise.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/19469834134.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/9819661987.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd29e44e2b---zogunavokibajenofiviwifa.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e085ec585b---xuxiponopowatenibosak.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91f79afdd---35678094262.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68bf187ac---19306773324.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lonovuxijadomejo.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/72462758544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=preview+combine+pdfsPDF 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_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 10768 bytes
SHA-256: 7e83cc46aadfe73ace6688894d3bf0bdcac1f6338eacdbd04a2c23c92284d54e
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 18436 bytes
SHA-256: fe2f9425d616f05c2db36f5801469c92d085b3e51ac4e0f10e05a898c2a712e4
font_02_sfnt_off00013bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1