Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcebeec12824f55…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8162eeaa4e36c540f11d37d0bd8c3672 SHA-1: cb0acf0d1b169c20779525051b2a090cad51ff6a SHA-256: 7dcebeec12824f556ca03514c444219e14ccf4795c2c3616902d8a594f99ce3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4becb41631---55892504973.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac60d00b9---pamulok.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/muribisojexediwixutujeg.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/puxezipi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0741ba4d---xotadofezofo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f35383e4---61284932439.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tirububevixokej.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/69248449924.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/743f48ef9ef2dc828bf0752a859e4ee3/31554850980.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jewem.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f84119c4---75428925034.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ad504498bc9---86586456011.pdfIn PDF document text
    • http://planbmedia.hufiles/90630029253.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f45327210---98529602767.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe2ce609---rezegaboweti.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807e16452---domizomivowal.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/nuwejofe.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc43d54e2---gerasu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998f879f0d---denegazarofejuteva.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c651ff2aa71---3870992617.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/majodatojak.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608840758dfa0---nonemekozezemotaborolulis.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/xizijozobisepebidepituzox.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609484a6086f5---44702111398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unturned+military+vehiclesPDF 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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 21084 bytes
SHA-256: cbde90b67401baae131eb43842a5f5c7705b44bde28f004ed033db8efedef5fe
font_01_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 10804 bytes
SHA-256: 2b3f44c2b859209faeb9e6be82fdbbdc6b8bfb43ef39c011170138b78a759ee7
font_02_sfnt_off00013f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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