Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0ef1429c75ada1…

MALICIOUS

PDF

88.2 KB Created: 2021-08-03 18:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01cec43a87a581e9d2f61036e1f7f2aa SHA-1: a7d8962b38a471ee33bdf6cd06412049f4c754f8 SHA-256: 5d0ef1429c75ada14e880f6980f0f46e3555aa76a4330206cbda83f2c6eb5e35
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites acting as a link farm. These links often lead to other PDF files, suggesting a multi-stage download or redirection process. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2jbufvipdjk8k4ul25eme465ug/tiwonulagoterubowiridolug.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/37985990642.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a4309a4c---36449157092.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbe645e1c---silotejapulazis.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1a1e5bff0009c97bc5f852a203d208b5/pomepimowebegagozoxode.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091482844e5c---jumegaxijajuwezuwiruli.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf38cb5f64---6701754160.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/numhtnipe8qq18jtra2ifqcncd/33247787836.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/17652de54dfe9edafaf127f4d469e24c/gofadikoninumib.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160840bcef3e3e---23575866990.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d04a857e---sudaz.pdf
    • http://acecaalcoy.com/userfiles/file/79847241578.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisoluvaduzutik.pdf
    • http://knshzj.com/CKEdit/upload/files/potelokafizazilefefit.pdf
    • https://egf.tw/test2/images/file/48275393814.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4681c4dcc13c81601945e819d4ae7758/31714702477.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc28d1755d4b519c1964effec26672f7/74086603347.pdf
    • http://joyearland.com/ckfinder/userfiles/files/xeruxijudinejine.pdf
    • http://gursakaryahukuk.com/images/file/belozakuwowedamoso.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/norotokiranuni.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/70022614211.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc667784232---bamovulezuzojozubi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=graphpad+prism+8+crack+mac+reddit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
font_01_sfnt_off00010d93.bin
42e6a67454d0b2bab746cbcdde99f28641f276708758b614fd6945934bf94537
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10848 bytes
font_02_sfnt_off000126ad.bin
84fab468fa41dca324aea07bc8c2517259a48dc3bc846860c8ebb7b30ebc0691
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 16968 bytes