Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d668d3aa669ac2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 04:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b602bc311dd820cd5faa63265fb168ea SHA-1: 5a18aa83684d607e596c3b71d6aedf5753686090 SHA-256: d5d668d3aa669ac2e1b32ed6e2e52481b6c309829dcae1e93f838e3b7d08b717
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7goh0dacr68oo27to8dqsqja2f/pomawel.pdf In PDF document text
    • https://theatresaucinema.fr/uploads/file/misejunegulofa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e4161774b---37192716902.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/71098793146.pdfIn PDF document text
    • http://sgpeo.pl/users//file/samujaroz.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/runetosusedenizane.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gugomireverabobojito.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb26f1673a---50996370811.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/banuzetut.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/63313727794.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/23041471773.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/mojekijufev.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/eg9rek53e8g81peeme87vppb4q/44281408292.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/finufolo.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8q6mlfffrgs9n5ihdffghlnltj/40714046612.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5b198f9026a913563f6eb1c627d18a65/mesebezawanar.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161299cf23b13d---febazunigevapodew.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lifumigaxalajoxaveseni.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b426a0d84---xilopusiworufosurolevaje.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9a77c52d08f8ab0672d8cfd691feee69/kudazabesomegaxosej.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7eef544578---pulumuwiwiwowimen.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/c89f8fbd2e7dbedce14e39d4aab10e6a/53201688005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=early+technological+development+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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16820 bytes
SHA-256: ab3a42fc49bc7a2dde9da7c024468043e8bdb0e32d72c391fffc28e7a7a34e3b
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 11064 bytes
SHA-256: 1d7c34719b49d0b1b5080cef254789c7ee0b577e7d3762fda04a1ea052ffab05
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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