Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b826ff4f8fd484…

MALICIOUS

PDF

135.2 KB Created: 2021-08-06 10:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6391a302e58d1359c7550397f0234c32 SHA-1: 9a2f37ba85b1e654c0e36ac602f867bde761ac58 SHA-256: 27b826ff4f8fd484d1d2f626ecbada981ace6c972513f3b1ee1be45ba36fd987
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be luring users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://mamotato.ro/userfiles/file/ferapazazexalolopej.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/021c34370077c698c989feb631f175cc/93346000517.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/wiwufuwuw.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1cf74317---bezatupewapupavepa.pdf
    • http://tehnicgaz.eu/files/file/livalupijamanujige.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a85eea5b2e5---39878397513.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf7e89f91---54723352891.pdf
    • http://manpukuorder.com/uploads/files/vapaxu.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/aea4fb792dd456404450ec60a44c2d54/87457302864.pdf
    • http://siripanyalamphun.com/user_img/files/23598309004.pdf
    • http://m3hotels.com/userfiles/file/valosufaxoxevopuped.pdf
    • http://fouladsazanco.com/Upload/file/735702099.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b555bf8a2c1---35612787430.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/pajomowilol.pdf
    • http://www.awakohchang.com/image/upload/File/5683735421.pdf
    • https://ipic.vn/userfiles/file/jumetaruzidog.pdf
    • https://nic-irq.com/userfiles/files/vabamala.pdf
    • http://www.nagsa.es/ckfinder/userfiles/files/vusurobutikoxezevedopu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/83bbb12cd06519fa2fa7916661f093fa/43374989426.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/gijekizejaworuvob.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b753913191---21170923249.pdf
    • http://lucchetta.net/userfiles/files/95402154712.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vjb97ij7jkbmtqg8thq95s88ol/tadonizelekidu.pdf
    • https://egf.tw/test2/images/file/73940621634.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hasrate+bar+bar+yar+ki+karo+download
    • http://e1pl2.nazwa.pl/busy/fotki/file/56953023104.pdf
    • 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_off0001adce.bin
dc1ed233f636b799f889c9c60a7db891f5a0fd93aae259bf4a8f817bc69d712c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADCE 18244 bytes
font_01_sfnt_off0001ddc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDC3 16792 bytes
font_02_sfnt_off0001f5da.bin
2ae7efdfce718adbeba75f7d92ef561bdd1ff0425a9587ae0c2527aea24fc7a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5DA 10664 bytes