Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e39bc939ccc94b9…

MALICIOUS

PDF

79.2 KB Created: 2021-08-29 13:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 76688152d95cde3b0aa573cc874f9bbc SHA-1: efb6a5427f2e526635a68f44009c83f0500aa46f SHA-256: 0e39bc939ccc94b9883e50b79085b7151876fdc30ff43a1b6873a74624179faf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/cvgel59573oh0350dvd7ch28r1/80064323114.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4ipbab26k705nlt6127a9ne6b3/5408327386.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5db6363ec4.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/wuwosobumefuburiwokutake.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/86865972239.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/072d213804e2954bcf1bcef0636051c8/viteximageribobub.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e56892dca2---nodopiwul.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/39f1166b2baf21dee76e871cb6408962/34370695388.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/pizakofiminaguge.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dee1d4cd17c3bf02b137b66d0321f5f6/fisuzipukevibajikosof.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-17/20210617190512354729.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/lolixow.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/bolewukudedosizidoj.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/labipakabavufuravakag.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zamabidegoworurebupal.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jov9d38v9iq3n1fpraainecr9u/fowowebadizofutibuwaxam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a403518770e---duninojenudekalow.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8610332c---jerudamapigowalodana.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r4tqf53u70dopbkjeh7e0isoo7/zuxokimatat.pdfIn PDF document text
    • https://red-adlay.com/upload/files/ligadesitofovibo.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/vasozulogoxa.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/dqijo2l8npm6sv2ocmpgu6g8u6/sagutomukemenew.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6e3c2db46a---jezarexa.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9be869be16b721c3273bede13fc4b09/ziwuramomanuzazosejusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+place+for+lgbt+to+livePDF 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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 17768 bytes
SHA-256: 967eda65d7492281178f99545ec95061be97b58c59d31bac1cf20e6a3cd85a02
font_02_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 10808 bytes
SHA-256: c3b213a435b3d5370e639cfcf36a4b48b12ea37996f1a5cc009db4a2922b5b7a

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