Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd459292c7e9100…

MALICIOUS

PDF

77.5 KB Created: 2021-07-16 12:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7b2077de9ee0bed13c069f45d5f868 SHA-1: a147b9e4b20f6d6d0635c31e52613ffbfb7f31da SHA-256: 6dd459292c7e910094a102f8a97731c2840a63d3926a25a2e8096bc983ac7e07
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or social engineering attack. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic to bypass security measures. Multiple URLs were found pointing to compromised websites and disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://abwpetersburg.com/uploads/files/78563933909.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3df4d2f8f8c5562422367df8457a7000/82895168960.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/vujudiw.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d654a696916---97082456198.pdf
    • http://sistersaviopublicschool.com/userfiles/file/lovajakozu.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/regixiniw.pdf
    • http://amsaneeraus.fi/userfiles/files/birez.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2ecb032708f293af94b16ca94c8692f2/91581445379.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca00c099b58---pozaravolonasimavutemat.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b328cb34---juzowatixegenalalemaforaw.pdf
    • https://divinenine.net/userfiles/file/livabekix.pdf
    • http://www.hydro-tg.pro/upload/file/fozarimalubevone.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077334b82408---49006408409.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052505381373499.pdf
    • https://diaochue.vn/userfiles/file/newunak.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0c7e479aee3ba878cbf55c933a7048fa/24936736680.pdf
    • http://promocode.lu/userfiles/files/nuxivodekafa.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/1rciv7rg8ip050nhfrtjqn107v/dedufasejaxetojagemekize.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8dcda5046---repipa.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/55011223517.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/286148f0ba064230951b27b8aa16304d/12833051211.pdf
    • http://asja-doll.ru/userfiles/file/geburolo.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/nuvexubivejo.pdf
    • http://beulahcooleycollection.com/clients/870349/File/lizunagajopo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f94003a68---vujexetapefisopokopar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=install+net+framework+4.5+from+command+prompt
    • 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_off0000c9c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 16792 bytes
font_01_sfnt_off0000e1db.bin
deca9a9d0ca272b70838f1ca8269e1926a2d64d9a895bc1b7695d9683db21d51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 16936 bytes
font_02_sfnt_off00010e32.bin
32e4a482054eea146d6e5fb870f786b50d4b77fdb9993608b33d2aec89e10442
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 11096 bytes