Malicious PDF — malware analysis report

Static analysis result for SHA-256 89da2740e056ae9c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 21:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d5b5d90a365417e1955b67bae36f117 SHA-1: a6aced4553c52d9ec98c61168d8b1763c09b55e6 SHA-256: 89da2740e056ae9c09122a78becb3f94f59bb76e9a23a9874eb1e266377a882f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

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://zimmerei-possert.at/85687066545.pdf In PDF document text
    • https://luatkhangthai.vn/upload/fck/file/21152118435.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/nukuvimobu.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/87306261796.pdfIn PDF document text
    • https://chv.vn/userfiles/file/vixazifutaraziber.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/lizukagadexaxevi.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/402688506.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/1010818979.pdfIn PDF document text
    • http://carbonelite.ru/file/36703595367.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/67646433337.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92420657301.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/33900847874.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kivifegotanelumunaponij.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/23370410662.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/zepimepakusud.pdfIn PDF document text
    • http://webursitet.org/Files/file/vesuf.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/nanilexagag.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613228f4c22c6---wadadinazafenagafib.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d15ee0894f1e7d08588ae796ed84bdd1/82939718321.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/sinepulazasepemazupupel.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/jemav.pdfIn PDF document text
    • https://datenglagi.com/contents/files/62133335274.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f940b797495c91bfab413e99845f1361/67396486604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=enhance+video+quality+androidPDF 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_off0000c50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 10708 bytes
SHA-256: e5d4595419c06d0f44325bde0e40ec3c77266dfc59dd4c5c7c871fdb47186050
font_02_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 17508 bytes
SHA-256: 3554b74c36717ec55310cbd5cd41a8f430f3d6ca2a9bef5215db2c412681828e