Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d992c17e082fdbf…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa37b3909c9c98b009b62306a9ccb90b SHA-1: 303905063a4a9f8f44a669b8094f3f0e6c51473c SHA-256: 2d992c17e082fdbf91c44bbc349ac3c0ebc7052992c98648a63b357561872dfa
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b901f9db6b---rodukodu.pdf
    • http://czerwoneiczarne.pl/files/file/lexogeguwowesenitidip.pdf
    • http://lovepetclinics.com/file_media/file_image/file/mexiko.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wujemowajajerigufepijigo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d30692093266f5663883f04850dadde0/sorelixa.pdf
    • http://bon-mar.com/fck_user_files/file/88004398418.pdf
    • http://thsport.dk/ckfinder/userfiles/files/96337377497.pdf
    • http://metrocars.london/survey/userfiles/files/pafosabowibotumozava.pdf
    • http://poliinc.com/upload/files/nufiwujetoz.pdf
    • https://bliznacite.dvsportbg.com/files/jaxidirona.pdf
    • https://zerling.eu/nico/images/files/1161423052.pdf
    • http://szigmetal.hu/editor_up/17594833590.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/suvusegodenaluwivovoti.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/22874caf925c4f126f9d61ee814c08ee/ponaxo.pdf
    • http://brezov-gaj.si/uporabnik/file/jaxaw.pdf
    • https://diarch.in/WYSIWYGImage/file/58384167630.pdf
    • http://thepokewave.com/uploads/files/romifupusozaxolujubuji.pdf
    • http://tnmetalworks.com/images/files/ruxitokademuz.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gixujupuz.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece77ad28c---92430092869.pdf
    • https://luatkhangthai.vn/upload/fck/file/16293815800.pdf
    • http://gesundezellen.de/neu/userfiles/file/godutulinonon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+app+store+search
    • 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_off0000e957.bin
991d6e7d7146f70c860c81539a7f36755da35a44783b285a9887d1d605524d85
pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10544 bytes
font_01_sfnt_off00010155.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
font_02_sfnt_off00011967.bin
ea4498d31b72a028ff31401b1eca181ce821aaeee53c2d8e1fcd4dd38491325d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 17236 bytes