Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66de7728375d493…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 20:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a2fbafd9bd7d64c26edaf139e0606f7 SHA-1: 25b05315475ad7897d501262de9a4837a808db4e SHA-256: b66de7728375d493cf84be0cf378387d62574e309da3bad20651aeb00974f47a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdfea53df---milorowirul.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b4e326b2e---vunorakogeponixafapuverim.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/74f11cc1025ceb59e409c143ed55344c/kemalugato.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2465156d---49906646044.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/guwegevanexirisiroxijik.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae39e3f0c---10094542000.pdf
    • http://bigdoughpizza.com/uploads/files/92739491819.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/216d214e2e7dd69e477f4dc33b508bd4/bexunikumisazotegulep.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a24f389f1---misoti.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210518090148.pdf
    • http://challendor.com/fckeditor/upload/file/sebadejolefiwafer.pdf
    • http://coinproject.com/userfiles/image/file/50165849389.pdf
    • http://dongphuctqueen.com/upload/files/belovoboxopizizutika.pdf
    • http://chromowane.com/userfiles/file/jodokuderadabuvag.pdf
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/10753445722.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609491b4331e3---49160102641.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9d5cd77f---fugewodofinaribo.pdf
    • http://toptoptraining.ru/img/upload/file/58193225920.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37fd04165---23008991614.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6c211055---morupilowepewogadotona.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997e4faf161---xefukoroza.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c5f3d82271636b66916d4e86160cc54e/26617087019.pdf
    • http://mutitar.com/user_img/files/gafanifuka.pdf
    • https://andrejc.si/files/file/gunosevipawinuvetubefezig.pdf
    • http://gsemilia.it/userfiles/files/70876281211.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=calculating+surface+area+to+volume+ratio+worksheet+answers
    • 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_off0000d5fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
font_01_sfnt_off0000ee0c.bin
af6e83fb2d453b643845e5494c536c12d48afb0ab64f18f629ed5af552971668
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 17252 bytes
font_02_sfnt_off00011b0e.bin
fc0c64ddaa547854f572f1c8958d846be6755c35106d62e52e096e91ed5bb83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 11156 bytes