Malicious PDF — malware analysis report

Static analysis result for SHA-256 b644613e9cd5d9dc…

MALICIOUS

PDF

108.6 KB Created: 2021-08-02 01:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 53da7d62b378a0b3346e93895b0fc724 SHA-1: 716dfb2d450f14e9a55fe89c988438bbe360bf81 SHA-256: b644613e9cd5d9dc5a5822aa996f343aa6058a49764be8ceb4837b827dadf4f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://smidgel.ru/uplcv?utm_term=emma+zunz+personajes+principales+y+caracteristicas PDF link annotation
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcaed0aa49---75441626182.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/11580814139.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b52ef1e8---bepiwopejebarapilajuboz.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/1144321914.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/44572789608.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6573656---demovowit.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e67635d3154---42752218661.pdfIn PDF document text
    • http://darienhighschool1961.com/clients/6/6a/6a5b14ca9cca6c9c7811e238b5dc87af/File/65734510841.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b7cca0ad3fa25ebf0ae9f0f5ed0b4c78/todif.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d2de33b9---49252716676.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43d5f37b70a6c42a072844b5e42d5223/xugazetibeb.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/merebafiripebanojefiruw.pdfIn PDF document text
    • https://polandpools.com/contents//files/kamubir.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160790c42e8966---80479033324.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d439586440---kukewira.pdfIn PDF document text
    • https://digireg.sk/upload/jigazomaxe.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/zevadixafimufuf.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/36f8e2d46ad8d3fbd57dd849e17197f5/75426069704.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/306dc1a49c0f85e137cca60d759d43e6/zimugata.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/pozalevafatetijuxuxinogim.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0c1743034db4487d3361289f829fd5e4/majosomajiwiwunamexadogap.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1db73d2671d74fa9524e6423f2eb1b09/losigaduzukenolesebi.pdfIn PDF document text
    • http://hidropro.hu/upload/bededofatumeradesotabuj.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/bopinidaluvesivanat.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/zejopeluxosiraj.pdfIn PDF document text
    • http://steammining.com/userfiles/file/49261820353.pdfIn PDF document text
    • 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_off000140cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CD 10920 bytes
SHA-256: bde153991dd1015d6260aca2ef32542dfb2d58d3e9b41ad20b29db8feb539139
font_01_sfnt_off00015a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A17 19892 bytes
SHA-256: dbef2e4e64b110a3ba0033c28e9082ff3e55f1df598e5d19715d1bb1ee2939d1
font_02_sfnt_off00018c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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