Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87141c2596ace38…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 22:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e771867f54363a1c2bff73f00b4437bc SHA-1: 6fab6145cec776898e6c87d81c5c3dcda41dbb69 SHA-256: a87141c2596ace386851b7dde03a80691ebae7b4f5381771ae6d68568484a43b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of external URIs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434fa82b0ce---duwoz.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/954007898193e3bba669fc1ca323fa50/rojiwasogoxanaloj.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/16520610486.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tuvologibivakuzabix.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/77914019746.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/29692813074.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/54049936847.pdfIn PDF document text
    • http://ssp.by/var/upload/41411904698.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/90533294269.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/jobabilo.pdfIn PDF document text
    • http://jph.kr/userData/ebizro_board/file/tejamagawapakow.pdfIn PDF document text
    • https://tepihtrava.rs/files/54872472366.pdfIn PDF document text
    • http://stefani.cz/fck/file/77048203865.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/95b831a7e0ae554391b58621d6416ae3/22772201961.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/tisafadapovonevidakubuti.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090623383552.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bijegoxefelodopa.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109070953341502.pdfIn PDF document text
    • https://datawire.gr/files/files/49110938554.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7473104502.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/munifixewusasipok.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/39545443414.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/bowujeligujeranobu.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/gexetepozekoxizefadolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=doom+android+apk+downloadPDF 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_off0000b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FB 19876 bytes
SHA-256: cc2d6b14c7cdb6a68390d1a24e363e447e11358eb4cc0d9b49ac6af61b8cc90e
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 10336 bytes
SHA-256: 6dec75b6220c59730cd755f6468b0ed7daae0cf00db618ed9128360981a0b8f5
font_02_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1