Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5672e975c26dc60…

MALICIOUS

PDF

98.3 KB Created: 2021-07-21 07:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe2ccbf73aaad9bed03df0f5106a85d6 SHA-1: ff7992f9a9691025a1ca660728bc171e1e511864 SHA-256: c5672e975c26dc603ee9d7b41f49133f432ca63ccdc36bdbd7cad4737d2db691
156 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 functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of multiple links on disposable hosting and the use of UTM parameters further support this phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bas849iquqf7pkff88q17agq47/dekixarefozixuxovakotomox.pdf In PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/polafegezivonut.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a719694dda2---tovonejepu.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/75975365289.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/sapobixiso.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dc53f0953cb8bfd3c848fbcda01645ea/53113486177.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/pht0oni67nl3smfoa14ueuce9a/tamufuvorexuxekevogoxanob.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd58d830a8---delesatifumugefivutun.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/80217726147.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f75ddfa3---lapapekida.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/tunumoki.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/goronadezipirubosudesosis.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a46f350a---lerizeloxejovu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lolivufaz.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/55940488264.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/61745906621.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/navaxarafevejagafiduv.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5d48f67040712fbe2e0a02298d6c0b68/kikosejijupuleb.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tinojetodawivori.pdfIn PDF document text
    • http://groupkaishan.com/d/files/60814498648.pdfIn PDF document text
    • https://0900107678.com/upload/file/16491130756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=need+for+speed+most+wanted+undergroundPDF 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_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 10864 bytes
SHA-256: bcd0a7fe59c177e9667ed93cf9e9256bdb9b46c59ee872fc9d03fb164c38b018
font_02_sfnt_off00014c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C43 17604 bytes
SHA-256: 43a436b620f6b93da27184d1cc1396337491204c70ab6c0f0b73b963f3b7637b

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