Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6d754576aacdb8…

MALICIOUS

PDF

108.8 KB Created: 2021-09-04 03:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ad8557fccce2ff6069794d3de6285cd SHA-1: 29ae5f906af343634e503893ba64cdff480a66ed SHA-256: ae6d754576aacdb81dc7ab6078bc788a0e27c76aeb88ea9e1a06fdfcbbbbd174
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tykhchem.com/upload/files/pozulamigo.pdf In PDF document text
    • https://comfort8889.com/upload/files/38108136505.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/julaxinin.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/21517625949.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/pozisapazevuke.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5855aa3d1f---nezalatipetiv.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/69413268311.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d192b13cb---45801596112.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1b4d56a4c76a4297ccee52ed1a8b67a4/sososelo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126aa524e93d---zagajupulumejulu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9335b3acd9---vutezuwemuwagewutidim.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/lofufexokuxivap.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ff7aee2---19225041580.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdf784f27---53019240395.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76102093181.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/xulasesakovoti.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc823c341---4188325413.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/55537806196.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/memiwutowosuburutonisob.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/84661249197.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bf35da02---59748890701.pdfIn PDF document text
    • http://allasclub.com/campannas/file/97327184713.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/12296264869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=le+poststructuralisme+pdfPDF 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_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 20120 bytes
SHA-256: a05a729e1b938d431fbcec6c56ac0fcfeeece0f82fdca0f6bd60aa3e36d45d4f
font_01_sfnt_off00017553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17553 10732 bytes
SHA-256: 2f8a03a96b1ee5218a69be8e89072e9db0605b89f2cd680c5729e51264dc70a3
font_02_sfnt_off00018e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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