Malicious PDF — malware analysis report

Static analysis result for SHA-256 321aacbdfc8fb116…

MALICIOUS

PDF

87.8 KB Created: 2021-07-31 03:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e0d8a9d18627c1af3705e2b921b84d3 SHA-1: 46fbc61a71f431226912542591e739dfbe0fcba9 SHA-256: 321aacbdfc8fb116ca1b09b3ac32bebcb7ff687305aff522815ab8a574d505f3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iva-vietnam.com/userfiles/file/14030943038.pdf In PDF document text
    • http://cobe-ing.it/userfiles/files/xodobifivud.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/roxirid.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/70669384986.pdfIn PDF document text
    • https://ghnservizi.com/file/xuzefolovatubon.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/93501822613.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/kizekopivoma.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/pivepugidifenopuzejubexus.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6e59e770e6b98c3b1abb17f8b6e4268e/68908815340.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160764d339fd54---muguzakefopuvu.pdfIn PDF document text
    • https://totounited.com/contents//files/14994761731.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085a76fcc3c5---72089790735.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e925cc67c2---82453793032.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d3cca694582fedc1918cae522b40d1c1/75211746344.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/36126190065.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/17051130939.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/zimonoz.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/94014833242.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084983c13d85---93604766067.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/44564903605.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/kominovipekukebeg.pdfIn PDF document text
    • https://inncredel.com/uploads/jerodizodujes.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b231c742f---tebarifejis.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6e4182d260d49d529832ba824105b86c/semeredijakotuwanavomo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087180d069ec---vadutiwinewuzizutofegim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+make+slime+without+glue+or+borax+or+cornstarch+or+shaving+creamPDF 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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 16696 bytes
SHA-256: b8a3214a27bd97bfa8834cbdee907ab260877a358559d5de43ec46d05fee1bb9
font_01_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 11508 bytes
SHA-256: 6b01daf6d39c7c1320d936642f20b467215c092f9bd7620f9d6f80ea2d678ef5
font_02_sfnt_off000138a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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