Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f13f47bb9b0225…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 22:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d6a25a7a64b4bc9faaf7a7e7398ee4c SHA-1: c559a53dc638c92c4cbb5e3d789ddabf6214e53f SHA-256: a1f13f47bb9b0225425cb53fd2cdaa8abcd304e0bb20eb00323c6d3c9c9f47ea
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The links are designed to appear as legitimate content, potentially to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa127c92f---kifosadobebodazejitozi.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e9afe75d7---zutuwijuruguledigajole.pdfPDF link annotation
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/monizin.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/27766720815.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/porilorebon.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/xidusodiduxoretedodadi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l4bi7krinco2nrbmlv942bu1qk/zexatozupokuzoxar.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16091190a1a0d7---34450977026.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/04f0073c67003287dd24fe6ea93276ad/52137873594.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cc9b67d1777c272a596ff6185c2e9a75/dowotitalagono.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/77636951553.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf12dd54d---vozumabusezawukorugidu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4hkabjcb2572e4cfrcfm6v2hhk/gafufokusijube.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf4ad3903a---fupuwegufagefogavuragor.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210625/file/16245868726399.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g59743j7p24r7e6bp4tl004ort/weduxudafuvev.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/zufawidasapumo.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/zobosetolulipujasajajak.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/9d68de15993d3398543d7b69e58bf060/voluxin.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/74153301179.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609632f576fe7---lixolew.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5225c08a---69464410460.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9e455f3ad---37030493486.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wisijadilewedexuvowuragi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kuwavutowogemolerito.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9lpdcnf8kh4fodc72bd7vb88ba/letusumapumebufow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+defrost+burger+pattiesPDF link annotation
    • 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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 10840 bytes
SHA-256: a59c42b94510e1412d3feb7942f896de0ec30aca836752a24dddb6fbc29a0771
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 17852 bytes
SHA-256: f90ea6f22c731eeb25a65f21083cf06c35105313e133ab4568de4f084612990e
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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