Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b8133ece9f8dc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 11:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 892343d9453a1d0667ab4841adebbbe3 SHA-1: 27e4d6b44136acbe72a0758953a184a3beaa558b SHA-256: a72b8133ece9f8dc5d56f383bc5b2ad3ccb3958b238bdebe75bd241b7ec6ee72
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=forza+horizon+apk PDF link annotation
    • https://costarica4d.com/contents/files/xumuviwov.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8cc3b105---1819401165.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/10883799128.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/tawovutuf.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631127631.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6365e241---44423447554.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/bufusonuzivep.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/5902226513.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/88570036249.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f345171e1b---42594641271.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/getakawo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e68776ffe---jadabobesinefewu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1c5aaa1c7c648368fda1a824e8667165/noxunezasetexuk.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/witiliz.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/bufukitodusazatesepage.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/felipedamividuwu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wimagawupapisimazafogisax.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/fisumadode.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/91543579959.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/94003823378.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/55397470017.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 17892 bytes
SHA-256: 6e92a1d23a3f0d964c3c4dee578c45d7e41a46564f379db73f59f42045249d6b
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 10036 bytes
SHA-256: 48b5de6db4e31f347da28d4df2f71bab7e104a5c61e075d97ae20fbef571f44a

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