Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeeff4efffd2d74b…

MALICIOUS

PDF

73.6 KB Created: 2021-07-19 22:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c11a4e68e9fe60788ff84399963d3532 SHA-1: acade504156e3bfde27b28e8dc8b668e592d7b77 SHA-256: aeeff4efffd2d74b4c9d7cee118334b2c359dfb94f103717c83e789f8cf361b5
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting. These links likely serve as a lure to direct users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dv154keu81sfi8scpocga17ev2/dekulumovozefefugaze.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3934c05a4e---doresisibusan.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/tesixomujerokakiruxovi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/janadofupeteburule.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087596457d91---lizegujuxuleburema.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • https://bczenekar.hu/files/file/7010969507.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607635e70a4cd---didawoza.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/63u05o4p8avevds5am1i8sa082/24812143699.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/fca0253c4b11369b52efa690a8a53e43/47002211163.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/800cd95d8ea3213dbbd4b4ecd7f45675/94327299822.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tixetexem.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/zufuwoji.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/heovgp2hp38uv7oe0grthcgf8j/zubizinadowajomarodejuge.pdfIn PDF document text
    • https://noddy.nu/images/file/jafomunadu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082188809b08---30915990894.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7342fa6205---xitajobovi.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/vokedawofagavogusovalom.pdfIn PDF document text
    • http://debden.org/userfiles/file/81878364046.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/19362414886.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ppmh5lchur2q6iarms938khrlb/xawivedevak.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/8355447368.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb73b5fc17---suretusezunitan.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070589336962---32014677512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+bible+and+same+sexPDF 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_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 16652 bytes
SHA-256: 4918a8a60e3a74b8ac0fbccabcce29b8378591e7d001ff459f9d50fcdc9ab192
font_02_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10400 bytes
SHA-256: 971e1232b71f06b34e6cbdd251b36e28e36b5fedcd30adcb64bcd31d20ba9e94