Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5525fd75de5d317…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 10:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eeaf3a4057053c35f68295d5ff912444 SHA-1: 5f1231d5a75ad3720b4328ddf5e65997ed33dfb7 SHA-256: e5525fd75de5d3174df18ad72962b0ccd10e4191d50c47a4413926efdd0b09d4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the link farm structure strongly implies the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16100cb51def3c---41971275486.pdf In PDF document text
    • https://patc.fr/imagesfile/56947071901.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/rtgqb11slr7um2v3tch7ip4svj/70217598991.pdfIn PDF document text
    • https://12tiga.com/contents//files/wunugujakaziwipidu.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/rawaduzonakagewofaweluki.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tolapasoraxonotokujogi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/rodulujap.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a88a1b800---mibokekepetumuginofaxezu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4ae3f4b0b33a435f8da069ea0d6009fe/56045826444.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fde8255074b30175a8e194403b4ada03/90259487769.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619f9e0a77---vomarinin.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/60408481921.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/90507q1kjkplphkl9uqeuedk2k/55041137996.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609951dbd49b5---dexagom.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/jelodikoxip.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d79d3d84ec2bc4f78a127ba9e14d57ba/zemuratopadogegeg.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zozumiwarisuk.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ak576oh5kd0s033b3d9psui4bn/xepexoburirokuxewuzopoxe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161242ce3909d0---nalumalutemogawumuxewuba.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d83952ba---tuxiruxo.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zotezejewele.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3791b68b6---34117098876.pdfIn PDF document text
    • http://dsagco.com/Upload/file/dedikorovesixase.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ce80ce9f7d1386ec01562091253c95a8/96555949305.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2jrupvat1lv86rmd7rvmo8htt3/64766635725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=rockshox+sektor+silver+rl+manualPDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 18372 bytes
SHA-256: abe914908e7cb375093b1d9f226578396c8bb28c29f2b77fd02a83ea5af18176
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 10900 bytes
SHA-256: bdbb1083aa2686d6c5303871b567137f0e82133354a65bfaabacd914b8e3a257