Malicious PDF — malware analysis report

Static analysis result for SHA-256 911089bc1f4fc16b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 05:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45d6ea85f6c0e2f4408d3fd04832343e SHA-1: 7b2424a53cf45f1e4f67ff7a3fa7d40235222ba4 SHA-256: 911089bc1f4fc16b18bc1c34b9b4e2b5b4215e2152420e8d2de17de042a18256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, so the primary attack vector appears to be social engineering via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://baheth24cars.com/ckfinder/userfiles/files/sorakupapo.pdf In PDF document text
    • http://tantusmarina.com/UserFiles/file/xetonoku.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19c180279---wozesusimolaza.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/88389972943.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/93703181771.pdfIn PDF document text
    • http://c-six.it/userfiles/files/zijixitotapinorefi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/gupalazobuvokit.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/81917276353.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/10395994286.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/75980987838.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/niruxip.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/fufibubewi.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/42656128349.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109012112523664.pdfIn PDF document text
    • https://ms1oke.com/contents/files/wanegemileximu.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/vivofawezivubepexudajeti.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/damikovozojebugexukawi.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/62604295821.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613082ec9702d---86766580791.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/83308499717.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/36291808395.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/muluvivegimorof.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a0948d0cc93b752c9005e9a38691f356/50500739767.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/kemesigogawopitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=descriptive+words+that+start+with+iPDF 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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 17308 bytes
SHA-256: 553fe23c960ce9794e9105c16fdf7e4be173c62957f6510f0977c9f99147c15c
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10616 bytes
SHA-256: eb6257d46438409ce2d198a93f1da027ee8569f0b94a266e5f48172916dd0bf5
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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