Malicious PDF — malware analysis report

Static analysis result for SHA-256 543fe478626161c5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 00:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fad42db3ec5a9a90f37601732acb14d SHA-1: 5c15226a087962b8a9a1845e17a098fd95e27378 SHA-256: 543fe478626161c5fb8887ea0d5da214cbb84708b019deaa3ad83df6ff53bf44
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong attempt to obscure the final malicious destination.

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 https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ef2ec34c46732262bca9a8d6b5451f7/fupadapigorewela.pdf In PDF document text
    • https://dnmpaint.com/sdcc/images/file/kawesumodozamope.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///94724397121.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p1eh538midi38sv1mo9909q6id/wezurozogikurive.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0531036dbb5f4229c93dfce072ec7688/gaxulujite.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/danedobu.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/33427070731.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/suritejijasudofowalane.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/1031029864.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jegigajegorujuranofiz.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/69406126076.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74699256885.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/fajolabinudut.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/lixebed.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161410d95392b6---71089743508.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8b2d3894---nulivenokoxujizimukuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50264e3d5---rixonediweruvi.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/kexabimikulepanidizi.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/84815696429.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/48798197715.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904032318.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/j092pv70dcs2405rq7da1ht5e6/46777398709.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/debakisumekotobabuxeri.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/vixolale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=resetting+my+android+phonePDF 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_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 17708 bytes
SHA-256: 9ccc26b74b573d06edbef45713ad0267dcfe0ec14bbd2cb746d39208d0300fa4
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 10952 bytes
SHA-256: 51a83911e12affb4bf51edb177d59320cf0ed4d4e97b465d21cdacd8710dd092

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