Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa116e1ede0ac6c…

MALICIOUS

PDF

103.3 KB Created: 2021-08-12 05:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76ea72cdb8f137a3b670ce2badd3a96b SHA-1: 3cf93e0ab29c91532d8cdf09b775cb9cfe53adf0 SHA-256: 1aa116e1ede0ac6c104d20278f02c543ce9ca6ba05ec37eabb24e94c42a1a303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing lure or a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f692dcd---48797444669.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fd114bd976e57da4039b06704e19bfcf/mowosorawijifo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3t9sqidgsgve1tp0na25kk6lo1/49461185084.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/37759395867.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74321bef76---wifolonigupezadagegir.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/fovib.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/21967595342.pdfIn PDF document text
    • http://abnicum.com/files/file/38477040784.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/moxiduwepek.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/72281917691.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zanopufizugiw.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898abef6f5---64410138048.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/70230198262.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/janato.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/kifuwavoronosaraxasekijo.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/6041208943.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886ee1c2e90---10007556589.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xaduwopotusiloxafo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609db75d668fe---92422703084.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7859de54d---33023792756.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846980695bf---pimafazopariduv.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/44249929919.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///19830920548.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/aphaea9u9l7riq2u9odf33o2da/74824866939.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/k3rok23gati6unpmrld8n94k61/debewovofalevipeleb.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd64cc23f---derapov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dictionary+worksheet+second+gradePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ea9b0f51d529371bbac68d454b09b8a0/fopubabesa.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_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001452c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452C 10896 bytes
SHA-256: a2bab8ed28f96059169a0bee47c144a1ea120370a4e4f5c4fa6605ab6ff79dbb
font_02_sfnt_off00015e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E40 18036 bytes
SHA-256: c99e132e598e5c2daec834c130c0a02578e2170262fa559b2e5c5afbba351bb3