Malicious PDF — malware analysis report

Static analysis result for SHA-256 c336a0eeb800ec48…

MALICIOUS

PDF

113.6 KB Created: 2021-07-07 03:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61d807706daebe251ed67d092399ac09 SHA-1: dfd4e01a17d3a4233658be16f5024b3b838c225a SHA-256: c336a0eeb800ec48dff27e9639222fbc1244734d884d7dfe7da23e018a769816
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7a4e059a---jexomulevaxurigixalebuz.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b7976295---1063696501.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/oc94pkc2od3b3k2untmrp043bv/57348334628.pdf
    • http://mwflower.com/upimagesfile///31919862246.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/648778d89b45e2bb006aa489075812b6/86533678294.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/793f608ad69cfdf14fc4ae7475c9e31a/90075858692.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/68156187774.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/tezegatejek.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8f785d9a---tibikedifaba.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d608f37f---fozonezokefilorifelobo.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gbvfspsuugpoj9n5pl2h47hv14/ladomibowajugubemifilut.pdf
    • http://youngshiny.com/userfiles/file/1622533349.pdf
    • http://stlnsk.ru/uploads/file/saxujudowapo.pdf
    • https://ngusacdon.com/upload/files/5201727870.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc2806393e---97012789440.pdf
    • https://activepymes.com/pub/file/kuxizalevitaf.pdf
    • https://jxloanchien.com/style/postimage/file/34367002335.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809622b9011---26363241579.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mft0dbfmbiljg5hlr3rotlp38/rofofeb.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/92653549339.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/19163666061.pdf
    • https://dadesigning.com/daduserfiles/files/83634853806.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5588b6e4993d527ae987ce2bc8ea21ec/jakisimuzog.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5833abcbe---17136288902.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=lucky+patcher+choices
    • 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_off000158a9.bin
058070a6ec3528d7a23444a7f51d5919577171dfb0e062abd25890448631e943
pdf-font-stream PDF embedded font (sfnt) at offset 0x158A9 18652 bytes
font_01_sfnt_off000188e2.bin
d07581d53b3d0f2c6a188b3d67d2e9cf0d8f6dd3e8903d5247de4dc473c4b749
pdf-font-stream PDF embedded font (sfnt) at offset 0x188E2 10584 bytes
font_02_sfnt_off0001a152.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A152 16792 bytes