Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f8cfa76fd6c9c…

MALICIOUS

PDF

109.6 KB Created: 2021-06-28 04:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0e6356fd5a67302f7884c40f6c28de7c SHA-1: 89132594b8b743b9fcef6960a0bc25031f8b042b SHA-256: f50f8cfa76fd6c9c1371d28422a8c2bbd01c1cf32182683b8ab5e9388b16cb82
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is also flagged for containing duplicate object bodies, which can be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18485ac8a---dotazulamamovi.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/30eec7911c778f4b54b40d74de054604/92044569336.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/o67aqp1cr216o4vmj4j7rf99c6/84670725502.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/3929161829.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/6jfcaj99pa8cdg4sisilbagk90/68673122731.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/26375047492.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7de1c328b---23819021288.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/t5f9b8mejstdih82qjogmch221/jexowunafaxekafidane.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb77c44888---84780222303.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087debca098c---33145344216.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836003320aa---85177644439.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jebanobelazibomu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ee9af331f992d1f8ffbbd013fdfc55f5/toberitewanabute.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/lizivewip.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/41468269072.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xibuferumo.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/34002559493.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/luzinajuzotopuxutinovog.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e453fc88dbaca74e7c3e7cca8ca1b3e/kozag.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9426bba60---93171888673.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wexulatagofabibetega.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f062aa6b7f87763ed2c6d6d776e5961f/feleve.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/48fda121b678d1bca7df5d9a9e673992/53997838156.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2cc850315---puzis.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3v06tngj5tmsvhe73ofcqleo54/97646759179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=8th+standard+second+language+english+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001488a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1488A 17268 bytes
SHA-256: 6d68fe1d84e1c25c11eaf614b1cec5f122ce1f9cd19950437d6548be2b9c7f8f
font_00_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 10860 bytes
SHA-256: 69dec617fdca075f969428dc5e9edf99a6d24126bbd094f9d4487a3fe6e254fa
font_02_sfnt_off00016249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A5B 17664 bytes
SHA-256: ad9c071d2f5c92bd6ad60720bb980603dd89be6bb75f64e5b0bf5bfbfe07518f

Open this report in the interactive analyzer, or submit your own file for analysis.