Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ae18483eec57ec…

MALICIOUS

PDF

96.6 KB Created: 2021-08-05 07:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 1f32ce6e8eb57904852980c7117d3bb7 SHA-1: 344f5df128fcfc3bbefdb484d1d7a8766dcb47ea SHA-256: 83ae18483eec57ec0a4004771029fb48f14c7ae96ab840297a3088c2488c4dd5
164 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 and are structured as a link farm. The 'SE_INVOICE_LURE' heuristic suggests a potential phishing or scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bda79d2533f7810099c8a285dcb59647/tavitiwaxipewevorugil.pdf In PDF document text
    • https://nasikampung.info/contents//files/gesotuwotetemed.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/viwowinaso.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36feefa95---39774185359.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6582390b67---32533751152.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c867fb77aa9---jupazasetim.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/wojijilekaxab.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/20444307696.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6b47f24a00d32eb794adf5f97539a05f/nejuv.pdfIn PDF document text
    • http://iphysiology.ru/upload/7407071202.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/60006884547.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fd89fad5---fapigawu.pdfIn PDF document text
    • http://absigorta.com/E/file/74203582963.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0fc31b3c03aff45f8f86f1bf619734ae/163589996.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/60686559799.pdfIn PDF document text
    • http://ciskmv.com/css/file/rojukuzunegosafirifogik.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cbe78081---repiwugasawisumamej.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/21440681875.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd9479c86---fufaxujitibenugutona.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872936ca380---zokogasipi.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107250133296210.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95a69e243---15643710153.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078083a06f0c---tumuxuzukonepaxezudigowe.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dasevaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+does+ltd+stand+for+in+ltd+commoditiesPDF 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_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 10732 bytes
SHA-256: 62b3b3adbeaab5120f62d280f9571b839456e5ed9887c9beb2b5c07ef5c7c342
font_01_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14528 17944 bytes
SHA-256: 13a384b21ff72a45ce6cb427abd9a6d24b12c6b467379e73ba909a1d26b0ea9a

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