Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae39846fcaa7f1d…

MALICIOUS

PDF

86.6 KB Created: 2021-07-23 16:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8724464ec592113f68224b0110697bc0 SHA-1: 6240883bde3ccd3677582aafa4d665804f8cec4e SHA-256: eae39846fcaa7f1d7ef789f94aad155b6a4e70ba62002b4de1a0b8bf223d5732
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a redirection mechanism to deliver malicious content or phishing lures to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t7ucl0itdp2bcmgejlvakma1q6/89049106092.pdf In PDF document text
    • http://funperm.ru/content/file/tiselutakakojivuvus.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8cd9adffa00754085a5fe381a89c396b/pazokowaku.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/a93cd10e35a01f02060ea7cbc0b63a89/pakebunimozurewutinet.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/73708350828.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c95bf5a7ef8b3e23baa8c21026a895cf/kuzibitifig.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/77800801203.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b360293d0a1---feguzabeb.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96d0f824e0---75741573696.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/27879066914.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/37585244497.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3465be3f---wozenugejoseruxikite.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/91285596961.pdfIn PDF document text
    • https://penal-garazh.ru/files/wiwofavag.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a305db3bc8c---futobe.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fb183f4e01bc4103ee967538536c73b5/farupomiwil.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/18200419256.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/40614355918.pdfIn PDF document text
    • https://topupdana.com/contents//files/kafogofepoxamexefanemuja.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/22428600819.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/fobisepaxawiwofajudid.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/f9t2hcdjulkotegl8vh04agvu7/bilupuzevozamosimugosax.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f17644165d530db060c2d6f200909e7c/gajovuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=oraciones+con+sujeto+nucleo+y+predicado+ejemplosPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/zixoxev.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 11044 bytes
SHA-256: f8d5e84ca7a91f9a2b120ae363333824162e86e431352f3719e6da5421c1364c
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 18664 bytes
SHA-256: 94c37c3a93a1aeae51613de89ef8c7b056c0507c2fd844688548956f858ab464