Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc82360dfb49a2df…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 10:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 749539f7cd7cdb2343ddaa67f0461e37 SHA-1: 7bad25400ea8be51256073a3bf52c3e311535998 SHA-256: dc82360dfb49a2dfbc8dec915a2aa0a1546d2cdd6fee24f3b5a81acc0eed8b5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=conjuring+the+devil+made+me+do+it+watch+free+online PDF link annotation
    • https://ever-progress.com/upload/files/rovobejopij.pdfIn PDF document text
    • https://gangnampools.com/contents/files/34722558708.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced444049f---vopogobumapoxevapag.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/teranukezosodefogu.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lumij.pdfIn PDF document text
    • http://client.diffuse.info/files/linakoxuxaf.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/24242836169.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/86349925124.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/66936309528.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/labetokuxizanibimut.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/paxulo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/mulajadifag.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalosifup.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/todijawopinar.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613857d8e0b7a---65042520705.pdfIn PDF document text
    • http://amandamaitland.com/images/file/zakefukubiwunobabegu.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/kawotudixu.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109110150437520.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/wadipagexerubegosivujodi.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/vinafalowafe.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/nuvobo.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 11168 bytes
SHA-256: 922b90c7824ad983632f05198c35ab3f5fe85eddbae4b60886823730fefb0ffc
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 17852 bytes
SHA-256: 9842c6777ccc7d594e5f5fcc62670fc76d5cf867cb68673f71f544243d7fcd83

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