Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ebb09a2d3c9c14…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 00:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f39e90297fae6c7ae9c9264f3b96acc5 SHA-1: 960de59ee39731dacd3a35b9a94e7db76f31df52 SHA-256: e1ebb09a2d3c9c14fa414d0f84add5a116925946229d7f007e8e3124c5dbf5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/68l2jje13etinmjaihopk08h66/watiraxab.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7b7c9e816051f44315a06005be3c6573/lotoxolezaf.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/paxot.pdfIn PDF document text
    • https://amblamy.ee/upload/file/28589484306.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xuxizorudaliwipu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9smk7566uq42rs4r48pa2hfn2e/kevuna.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5307a7ce7997f72a9eeb340a4c1687c5/32130455100.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9893a23dd14e1d415d8393f26d2285ff/xexuladazapodikap.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tlo8rv2cj8shfurkvkhpmuuf3q/9964556982.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/l4fbhok6q23i0m69p9hgg2ejjt/87938700432.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a32d5aed5da110340f26044a4528afe0/majagokosanezerevekumaxa.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/64550189560.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/zeravibovag.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1370d03c0---bulodexapovozufawagugeke.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/busejitululijep.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cf624d942a11a0ec28b5d2e3ed7ad10d/nowikewewukolivanoziju.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/tasularejolinosexotobi.pdfIn PDF document text
    • https://ekransamara.ru/files/powagizapetujazokanenine.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/didafagoxoma.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/74266813330.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612657851c1ea---48511217939.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bi0oedqi6bibkfquqk2uvq8dpf/mupigoluzupunaze.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jk870rc3ighrkns0jjfri0vqmb/dosozonidolibizusejosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=igcse+chemistry+past+papers+edexcel+pdfPDF 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
stream_004_off000130e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x130E3 11008 bytes
SHA-256: ee6610787d7b4c798debdb5b7ffcb89df8e8a8d50abcc3127bf650d06411ada9
font_00_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 18312 bytes
SHA-256: e7c875e56b9a0e1823cbd2595bad6f7e61b727742659f3c260d133d45e1821ed

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