Malicious PDF — malware analysis report

Static analysis result for SHA-256 eedcb39a0a94fc28…

MALICIOUS

PDF

77.4 KB Created: 2021-09-11 04:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79f7b4ab74c9d635dfeb690de6dc62f3 SHA-1: fb626f7d99a2692f2ee13b4829265e73d8036fe4 SHA-256: eedcb39a0a94fc287c12ddaa86f1452ad9b693996fe8378ec7b0c9c7274067c1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://kentacademymiango.com/userfiles/file/53413055385.pdf In PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/71812532356.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/ligojugonagaja.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/falunujeji.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kekeribegivavajozovetanuw.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/maturonokusubu.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/7476555500.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8bda4d72---jipos.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kdvii9ehvbljb4vu74sinbroj1/xogizinelujotiva.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/53605491239.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/tawekunadofepapegudi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/baxedazeritabonas.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/efa5dd612d7823da3522f61309d2970d/46940294150.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xofewezule.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/86291573847.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/dejazo.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/19550767535.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/26824450179.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/voxugoderewidav.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/kakanemakido.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/gubokufixexinomo.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/luwozamisodegavode.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/tudilurorurozu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/wuvelaxuweb.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613424c7b8ce6---rolukojan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chris+brown+royalty+zip+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 10788 bytes
SHA-256: bf33c434e5a727d0c5b5a232c3ba85e864797c5ea8253e1c088ff173e3352808
font_01_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 17228 bytes
SHA-256: 75c584ba61af5adbca9561553364bc060348abdd67dc121ffc2c3236fc1caada

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