Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf07931c709890c…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 08:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2aeae0a47fbcd2d5cdd797f92398fa10 SHA-1: 741ece5d87cd56644c5045f7e4d6684e931cb63f SHA-256: ecf07931c709890c9f7c1a96edaa40b583aaedc5e7b2578b386f5c39d602166b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=building+construction+questions+and+answers', are likely used to distribute phishing content or further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=building+construction+questions+and+answers PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/50nn3usp12c7qndsehnb8n8o00/dafoguxazafofusemefudiwel.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4964be40---vejigodekotogid.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3jucr0k14ocftiroe781ll4nmc/kexajixedagewijuku.pdfIn PDF document text
    • https://aashianarealty.com/file/wulijunetowupowumiga.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ba778d53aedfefb88f3597276b8d0593/27813917617.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/dki5e5ijovb76uutmopo6cia4e/46052256167.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ddd9549651c4232f83fe3194fc413283/sulewo.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210516015005.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/kawojaxusetaguxe.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210525100659_821688916.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kefepofapala.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/pixupozaribuvike.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/delurezuba.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6a7bc875365aa58b664d0f4852c69015/1651809045.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/28603152906.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e8ec24fa---fibinebinojiwobaxa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085074d99ca2---jikaper.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/86718682055.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/51575738318.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/299c4221470a909a530daaeb169a1c33/52928112926.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab735abd61b---71034869764.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/nitanaku.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/1264738085.pdfIn PDF document text
    • 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_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10932 bytes
SHA-256: 111885f4d5f647c2b44cf5aa85b09396bbb5aaca95e7e5742534e3a7977718bb
font_01_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 17724 bytes
SHA-256: 90c9a097e5a1d34cd54566cba733647794517bb7b76eb90dd82e1dc8d258be1c
font_02_sfnt_off0001389f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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