Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e05e0fa820829e…

MALICIOUS

PDF

100.0 KB Created: 2021-07-07 00:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5540c8de0d30eb55a097aeb0dac31d95 SHA-1: fae2bab1a2650e7f24bf79eb5ac45792432033f0 SHA-256: e8e05e0fa820829e90dea97a5c5e411e3e4316fb14757bb10a6682b679774111
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://limmaginebistrot.com/file/33250293330.pdf In PDF document text
    • https://acronimocostanzo.com/userfiles/file/82816960447.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7085336f5d781683d16849e215adc3c3/puruto.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160916472066cf---jikewedekelufefiwekale.pdfIn PDF document text
    • https://windsbs.biz/files/file/gemoxujez.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b279da2747b---pilupujedefepif.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/rivakimawotek.pdfIn PDF document text
    • http://kalikraft.com/images/file/vaben.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d01df92c---xuginomobaxutokutu.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/76966683509.pdfIn PDF document text
    • http://bichvan.vn/upload/files/nozitafukezepuxuzejokare.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa70b713e78---38834418103.pdfIn PDF document text
    • http://dzbnf.com/upload/file///ramupufo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruweru.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/ritaxipubalekovuto.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/37682213224.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tixibevupomebuzanufur.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/tuxod.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/523101bad656c74e086583d5a453ac2e/zenakebujito.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/90787931475.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ako2f4n16262rd7f68a6eh39uf/wuragavuwexelutiwo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210607042648305.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447e3eeef9---9620785171.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/jelopolevomavizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=joannas+leveling+guidePDF 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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10384 bytes
SHA-256: b961ae53e1d5eed2444e33efd24612491c74d51d99450482fba5a0be461b33e3
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 17348 bytes
SHA-256: 2e0fbca5917269826973ea19080a6012a6b6d0bf6c403ac74b9491983cab8eb9
font_02_sfnt_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 17696 bytes
SHA-256: f5364730f731469a77571cc25dd72dffa6c63edad59c5d0c578690335adcfb59
font_03_sfnt_off000168d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1