Malicious PDF — malware analysis report

Static analysis result for SHA-256 6537116f8586147d…

MALICIOUS

PDF

92.2 KB Created: 2021-08-03 09:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bc0fe045f55ec1317dc3b77d3cfa7fa SHA-1: 4a2ba5a0a36fb67e6ddec78f870f6ecbade6d892 SHA-256: 6537116f8586147d9cb3c87a011b17c0844ec63932ff9390c00580445ef162e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other potentially untrusted domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0138409493---pezeropot.pdf In PDF document text
    • http://statsale.com/data/upload/ck/files/zunodawato.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077850f5c80d---gakup.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/gepogasugegolawutikupida.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/20368092183.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l9a5l66enimhcuasvdf04gee90/53475191375.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb493faec68---womotaresuduvopomot.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/safaxajudokuvaparoxime.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/lanibaz.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/nakejupebisikapatedel.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/99684025287.pdfIn PDF document text
    • https://wonkingchina.com/d/files/95325974654.pdfIn PDF document text
    • http://falerisztika.hu/tmp/lipusovixarefo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/rakelijofujedufozulizonu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ccea35484---sukeborotanamakeku.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/fr7of4s59e8fgun9a23ig3o3m1/23504459122.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093261eeaba0---seraverizovanagajadin.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/72459358168.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/seulhc77b88ncm6v62fv3aamh8/nuzevegumimesuvewigi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/babodowedewati.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b185eb42c---jufenogu.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1p1pn09u1d5hgpvan9u57esov2/64533568668.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4755775ff4c34f8081a9967398e0f3c0/welupubegutivu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/aef3e61cd030fc8e34533472a79fdc6f/sakuxivorukuw.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/65118277065.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///zavesidelemobokula.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff8583057---fexovilarofunawudilosaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+practical+relevance+of+studying+ethics+in+daily+lifePDF 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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 17976 bytes
SHA-256: a0683a6526b23082abc811de6b0fc32dde0831f5f22a9af5523e7608786ff3cb
font_01_sfnt_off00012fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDB 11172 bytes
SHA-256: 42836024d46becc3fe0d17542311a982c49e4b4a166955ae502491531121cb61
font_02_sfnt_off000149c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1