Malicious PDF — malware analysis report

Static analysis result for SHA-256 f114e884dcb02e31…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 00:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cd1c9905e58a8cd37b68809bbfded11 SHA-1: 3dcdb8fb3d5bfbf7988c6a07744c0c9bb8598839 SHA-256: f114e884dcb02e31f77f8b74c779c4dc039bf6579ce0ad0330188c55711296e9
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a19454507---bimotol.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/621eed2c8d3f78645f71628d2aef058c/8257081056.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9ed589c3ffaea1986367260cf0829d30/97156986186.pdf
    • http://hiace-yoshikawa.com/js/upload/files/welirago.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6c87e671c99f17e054854db85c9b319/90394506103.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/94272165561.pdf
    • http://bjsprt.com/uploadfile/file///2021051607505860.pdf
    • http://np-laser.com/upload_fck/file/2021-6-21/20210621013003274318.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b473a2653f2---61509228981.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b55736e38---sedevi.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/898e2639a6191d7b4c19c87dd268224d/bedujon.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e92a63e1100ab8ba0c05f8792295510f/lidoxebanofitonililope.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a690bbb0de---komopugefaxunofikexipeg.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e08a165d---83985163531.pdf
    • http://xlsferrosilicon.com/d/files/66393764811.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/wumofibijoxubodefopibiz.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609484ad1cf3f---titexadezerid.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d05c38051---98031186481.pdf
    • http://didaconcept.com/admin/fckeditor/file/mejixurumonififi.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fuv5p8gds7cahsth1qbvuai4dj/65881843858.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/04b0d647e8ca828e63e371a37b81592f/98379406064.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1811d7f1ca---jeripivixogebipu.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e0707b927d502da62e60f361ae806b7d/60827505394.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2fc526ab---20410170127.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+remove+an+ink+security+tag
    • 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_off0000f5b7.bin
e02dddd310a8a2af6347e0f5540c84c4d5e8b546a77cae32cb2c16b8397cb2d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 17444 bytes
font_01_sfnt_off00012331.bin
bf09e49b73eb7c889e0129b2eb940f9dfbf44c24f038849ebe3ee87eda36600b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 11116 bytes
font_02_sfnt_off00013cfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFC 16792 bytes