Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a371bc6a129861a…

MALICIOUS

PDF

97.6 KB Created: 2021-06-25 20:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f241992f449c2fd1b4a88579f801a2db SHA-1: 2ff4d285232019ad1f0d655f9609632816d7d451 SHA-256: 5a371bc6a129861aa49daa66ee9d3a1313a7890d6b12b7d84f4ee46bb771137e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the heuristics strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://videofilm-tv.ru/content/File/vozeselopobibazanabed.pdf In PDF document text
    • http://tiwtactic.com/userfiles/files/tobofevokafatejevegukudas.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8tfi36i173vjkarvnb4i0btqef/vevimodupixox.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgjavq0ev917qe1naikhdrust1/ziwukesomuvum.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/kawetomunobonikope.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210612014715109.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/novasaxumow.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/42839531036.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e1e046cf---xewefewipawevegimakogu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cce09432a9d65669a338f1d406e33ae4/70371926170.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071d12995b34---38604348379.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094392696585---94298305820.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd14de1e01---fupojotofag.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210609_E595CBC69EFE539F.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/86858932502.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/b3k7ln4ecftj7fj8e3qfet26ih/jamawom.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba935f47d6d---53544695966.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b4761f203eb---sewilefuviveleretefo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/28505954550.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a8aa3fc4af27e41ff7f7298aea32ab4a/fufidakazotinozebuxosaj.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6333ba54---49594822466.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/wedetotevesu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160766ed56824b---24779672898.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/nobax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=irwin+dancing+with+the+starsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 17916 bytes
SHA-256: 226b9e3985770f950377908c41a6ca715f283a515be0ca6b09e9fccc40131977
font_02_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 10520 bytes
SHA-256: 8156ba2c237091dcc51d2a46b82811a2eb4b51d811783b7021524e05bc2e3b96
font_03_sfnt_off000160a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1