Malicious PDF — malware analysis report

Static analysis result for SHA-256 c478a2df7e314d73…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 01:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34bfe54b16ed65a16e9d8d4df9971d29 SHA-1: 8da8f9be1d607f678290f732222c2d3021ae2af2 SHA-256: c478a2df7e314d736dcf2c874ec8336adf0c34227a2abfc783e9de7393da5b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://emblem4home.com/UserFiles/Member/File/futuvutoruretafarunozega.pdf In PDF document text
    • http://phrabat.net/UserFiles/File/fubafuvasu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909005333287819.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/24412158464.pdfIn PDF document text
    • http://domuran.pl/files/file/1341314342.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/fexubizenel.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/fijisavotuweniw.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/87886658927.pdfIn PDF document text
    • http://reylab.com/userfiles/file/bimemigojar.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/jejitiwesik.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/feruxisasikikeravedevi.pdfIn PDF document text
    • http://cartopack.be/Images/file/tepekamuwejuzevemar.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904000350.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u4kl9uc5pivun2d91ed90vfd8n/tuxipokizavokukutarowata.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421cfe911a---33828840483.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/5051769032.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4694ab86d97548b4cee9ced7f5f4e45a/88871127526.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/natuwizef.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/pepadogitipivexibisomerir.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613662ab5cfab---13693696764.pdfIn PDF document text
    • http://anninh247.info/upload/files/sitibezijumab.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/39885950468.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/jexuden.pdfIn PDF document text
    • http://okvin.org/userfiles/file/wowop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=naruto+shippuden+262PDF 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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 10808 bytes
SHA-256: 1a05ff678b09269e84e732b77373f0b133cdf1027c5ebc8ff3ec3add7906c73f
font_02_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 18464 bytes
SHA-256: 58ddba69e1886b1910951255adbab6cf3467e4841060e41d4ca6e43742789c45

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