Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae93beeec89bd3a2…

MALICIOUS

PDF

98.5 KB Created: 2021-09-04 17:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 794248fe7dbbb389260d3df4c0ef10e5 SHA-1: 7035aab33b71b123a2fe3941c2b02fff0428eb3a SHA-256: ae93beeec89bd3a2b74a283dcf148ac491f0c80c1b9d3d748b5ea5a0e4b9bde0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4fba801c---juzokilagajoxiginar.pdf In PDF document text
    • http://nguyenxuanhuong.com/upload/files/15239549097.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/5v79e0icelns28dl8d0t6peju7/26732925099.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b2f42937f0134f3f01031d470375f2d1/34521978908.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v04oti2lueoqohlmhppi9dfhko/71067963049.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/nisidopogelilevigaboxa.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/gomumi.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/79070984191.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/wemofiwovetiboxidapojide.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/ledapavu.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/34758181409.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3ecc0d6b---73754395229.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef191d2f2---rovutekuxina.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073754995f71---23767837661.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/bulaxo.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/kidijizapolapov.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/43986834777.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tavaduma.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160773967e6ba5---didedewisofazonokomagezi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/95951105112.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c43b0391488b60ca16f0377f041d4bcd/nikobekekividave.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c6fe4dfb---51866263885.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d750fbbc---11380209514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ejemplos+de+actos+administrativos+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
font_00_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 10960 bytes
SHA-256: 54256707730c2d2dc38355bd9c5835890428c41900f141f3bde611151f920859
font_02_sfnt_off00014c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 18856 bytes
SHA-256: 97d642a09c8f9b98f1ce22124ca29b333ee24cd622549598ed6a0cd888e0234a

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