Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d45b6b44a4bdec3…

MALICIOUS

PDF

99.1 KB Created: 2021-06-26 23:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76fa2c67c2b252a880b91f7aef66704c SHA-1: 511158dd765dd7e2c44a62d180a07fe34e333803 SHA-256: 7d45b6b44a4bdec3da4ef6cbb2bd952d337fd833cd14a94373414842667041df
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c8f64b68.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5e0288b7---50097644265.pdf
    • https://akapacha.com/userfiles/file/lerezas.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69618ad8f3---95958734543.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081049b5daf2---dugasojoge.pdf
    • https://mosallaesf.ir/uploads/ck/files/72812605259.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f01fb540f---42503851465.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/745d13496d76ff5ec21adaa22327ea9f/28356114888.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/621b597fd15eab59a8cc1a423908be96/bakaxuz.pdf
    • https://autosaloncenter.com/uploads/file/josoluxevukunov.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd59ccff2---ziwenatefodesinolawo.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/toj10hj39e7d73chiingtrcuc1/44679609586.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d13be517ca1d47b9b34b00f1384a33f3/lodoxew.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a8377b859927303f243322fe3fa7f4c9/37380365001.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bffdbe9f97da3dd95fe06511af4516b3/vobelufob.pdf
    • http://granite1962.com/clients/869125/File/pelusapituzojurapilobosa.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/pamalunomur.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b71dc5438---11326834362.pdf
    • https://europartner2.pl/uploads/34777594765.pdf
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/fawurefuzasikesexewonulon.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987db0690ed---68956368049.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/db13de76fe6972c61a4e6c984829432a/60255866193.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b535a69b6f2---nawisope.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=words+that+begin+with+an+i
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010334.bin
dda236b9c855662f66474066f62c56596dffd7fd53cbcbe07b0a2f64328afe93		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10334 18108 bytes
font_01_sfnt_off00011fb8.bin
162b3a4630a66ac3f1a059cb8207ab3d0d476e7205818416debc783ddf8b0971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 17276 bytes
font_02_sfnt_off00014cad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAD 16792 bytes
font_03_sfnt_off000164c4.bin
254f4c55a60ec379b5dc05e4b63ff6684c4000079ba19f1167a2d03cc8fed246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164C4 10700 bytes

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