Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70ac2ddf5f2b565…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 23:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ded3ce57006a996e6d3d639d6d3fbe54 SHA-1: 984a1628e81cb8df0038576e9abdb17b2bcf1770 SHA-256: a70ac2ddf5f2b565f895d6d6424e1a59f9411584ffaad44f3d95911b63e27572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm heuristic, indicating it is designed to direct users to multiple external sites. Several URLs point to compromised CMS uploads or disposable hosting, suggesting a malicious intent to host or distribute further payloads. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lachambredechos.com/userfiles/file/bukigalunopaji.pdf In PDF document text
    • https://rotitelor.com/contents/files/volevajiwigasinas.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/nagoniladubakoxi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5f2c6e9a---96401909171.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/35779053473.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/26520369439.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/savitimukasekukugid.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rupowuwugakovoxe.pdfIn PDF document text
    • https://matricula.arendic.cl/files/39860911786.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/9390498705.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kabawavaxazara.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fitufefuragezeruwuk.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/83031137055.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/kemudoduvibujibesetuf.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090812495211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b48711940---43931060630.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juzitifumi.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/90178762379.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161314421cfdea---71548763247.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/85565037194.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/71463446882.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/96561424075.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16132903c9f3ac---nidederanogexegagi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b194d621---44549627900.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/gejifoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=heroes+of+might+and+magic+android+downloadPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/jiruvejedamoz.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 11000 bytes
SHA-256: 15dbc126965760e2ec132d3f4339dfaf37daf6e6a5fbb757d26a28dd2fe2c873
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 20568 bytes
SHA-256: 40bc6de5352379b5702ed3b98b9e4d3810d966041a7961ca9857a3c7abeb6478
font_02_sfnt_off00012789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1