Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d0968da773c373…

MALICIOUS

PDF

85.9 KB Created: 2021-07-06 15:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 110989e04cce1abab4e4522b4d351bc6 SHA-1: 862c7624d8e4dfd84b4e6d8039cf9e42571a5b5a SHA-256: b4d0968da773c3733c1e49b1ce06991adadbb49bbd2edce0f89fbb99375a01fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious further supports this. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf2c8f74d---nufunizepozunesoriju.pdf
    • https://myphambambi.com/webroot/img/files/wewexogawat.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0928acb25d663edd468e4502b6c45a75/kajixadotexe.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc13380f34---40656890656.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ccf4347d---86878754498.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d18aef0bee1---74767981900.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3be83224---48577043607.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/jexuxadoxitiburiwesul.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eac88d9633---40137909554.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/binoguduk.pdf
    • http://seoulsquare.com/userfiles/file/nonazetekepunam.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c416d633fb---guwobimog.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d039d509b8---potuluregajurivagi.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/2f14c4e80d7a62f1d04991a025c3fa08/xojoxujagezesanazetizuxe.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3652e70d901ff710778fee7c41b02ef3/motakunejetapasepawisi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c454b2321---gezovov.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd9d3eb69---kijovifafosik.pdf
    • https://babamore.com/upload/ckfinder_temp/files/20210601205058.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f0b45696e9207db896779b4cc0ee733d/xepiripopofizutemili.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c206e665128---xepodipavomatizepajexoko.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/gt15ovv3dp9co1kinjo9lfddo4/fizulixus.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/idi1tf1qfigmrg93pjfqslj9ei/42206545414.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a708431e46.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50e3dbf7d---19187131131.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=methodology+meaning+in+malayalam
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin
99fa0c2453ea132981028167ad56753a7450665ec8d78fe3024d2031a7d53322		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 19500 bytes
font_01_sfnt_off00011aae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
font_02_sfnt_off000132c5.bin
b0a3cff8f04298dc94e6d467c23ea150ef36ab039d54c2391e67b24456ef1d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 10532 bytes

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