Malicious PDF — malware analysis report

Static analysis result for SHA-256 709e3e3209e6c679…

MALICIOUS

PDF

100.2 KB Created: 2021-06-15 22:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ada9eb5b08df9118bbcf1bc3fb32d252 SHA-1: 4089d07862543bab08e9bb1e9351d60dc95720f6 SHA-256: 709e3e3209e6c679337dc70eaa64b70cc6de6d7840a3e066dec796dd5e9dc732
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the overall structure and URL patterns indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=euphoria+season+1+subtitles+english PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3e9a87e7b671cf139dcd9fd6445be36e/78686385692.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tuvumapezepuzamejejo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b363885e25---85195608425.pdfIn PDF document text
    • https://bnovum.hu/downloads/43752140545.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/shb9gocbopbkjp6jkk5chjo72n/ruzexetubuzi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ec9c8e21e---desibafis.pdfIn PDF document text
    • http://4bx.pl/public/file/deweke.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kaxigozukufef.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c937629c---47584548735.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/38369777383.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bdd3876---nasewegedadonono.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/36c9u306iojean9t2val7vs803/degupuwalesapubixibod.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d4aaab4d0a2413c94a98b43cf624cdf4/80892474453.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dofodorabixotazug.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/levenoxosufutewunolosufal.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2b901ac0d---tuzeximenil.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9855ad1907123b1fc87e697abf251f74/lonepopunisebitiwagur.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082e232dc9a5---kisutomolijijifo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2094afa39---kuvovorotet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015512.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15512 25444 bytes
SHA-256: 7cb500c0bcb8c8dc9c20d8feb21ed26c9ea4fe879ed7ab3bb565584c6b92b210
font_00_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 3540 bytes
SHA-256: ce3e81e2e2ddca6bdd695ee86aee75672eb9b02b56f84963aa0aaac1cbfc1bc3
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 5228 bytes
SHA-256: 9699e4973b9062791d0fbb5417c5587336ea17fa5a341b17898e487086eb7492
font_02_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 2476 bytes
SHA-256: 45e163d17813ad1a65db85f6f1dae7d4ac668e5c1b533319fec5b96b3a2198f9
font_03_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 12076 bytes
SHA-256: f920be3999519411cccee3d20bd1f2092c5b94a8dc69d95619d5a952e877dbae

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