Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e757f74b4a8da42…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 10:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bbe94d0e680c916755b6a1414d55f305 SHA-1: 26486f12f1fca7b7a1ee08979419306b4a333a60 SHA-256: 7e757f74b4a8da42ab598c6183437142be82c27503f4bc8a27b74787f724ed12
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its structure, containing only an image and a clickable action. It hosts a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/86a41aba29bde8b86a07da41282cd92c/80292912923.pdf In PDF document text
    • http://debten.net/UserFiles/File/sazaxegizu.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wugupiv.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nazabelidafuxuv.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/70e85236ce63584022ead8321a3387bf/35162958580.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/bejewepurixotij.pdfIn PDF document text
    • https://togeltop.com/contents/files/87253842679.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/mipitigabesi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3a7d14756f8b466d84db662c003b07a7/kumowukelewujavolatog.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/mikiduvibodoto.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/tejazufud.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474d162fc5c---70345781639.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/8960892793.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/rajofufovobelexefonepi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/fujivoponemuwiwifoxuvikaz.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fd7e6473f2e96eae3b324949d5e32a4/ganik.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/74069944986.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/sirot.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/66253518274.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/34845052086.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/bajifedumilujenonofunupuj.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/tixesulasekujezap.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161485d25e9b9a---nedawogojewobivaf.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/27708121273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=clash+of+clans+clan+games+april+2021PDF 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_off0000b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 11156 bytes
SHA-256: 52f51b21a56ed42f2999c5b7fb0767afad905464f50e2a4684d9b732f4627203
font_02_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 14172 bytes
SHA-256: d65ee1fed162634614b9b0f170707ce32275a90d7b02259b12a6e13304e33c61