Malicious PDF — malware analysis report

Static analysis result for SHA-256 66868e69c960defe…

MALICIOUS

PDF

82.9 KB Created: 2021-07-18 02:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 089d74f243c289d5ff6ea80ff599256c SHA-1: 25ec63f6d486f028f987dba2c1f1939c637de4b1 SHA-256: 66868e69c960defec9bf709ecf8061fbe597a6e7541f6001037cb1b5ce030022
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a863e9805f8---81349641549.pdf In PDF document text
    • https://euroroma-bg.org/files/file/gadarigozazetil.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/palimumewejavupetukisizi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893a204fefd---25029807069.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hklnqfjfeoev2sh07t28hshn3s/mivukabojumov.pdfIn PDF document text
    • http://mp-journal.com/media/file/zasosemejazifadusotexux.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb7aa56cf9---gaporakusefujanegus.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rfbituc3kgg3s93n05gf5jtosc/84854823401.pdfIn PDF document text
    • http://malifer.hu/upload/file/mozugusowikugowopagosa.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/7838434c46f7b2e0aa111a6e20a90844/97111110264.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2007540442609eb2d08a857.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/14470320283.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733b8ed5d4c---52800856892.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c7j8sau19ih91r6s3m9f3a2n18/rewozaxobejiwefaziru.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/bebiziwokitujakinedukaxid.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c4cd66c3---33519196677.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6577ed2673433f806000eeddf49e39fb/22972213031.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/56471300419.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4501c1fd---fomevototuxaxobi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/630c1106a98117463c72e334e40d5ebc/ferawamevobirigaxexelabu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160944e1c89188---64613973960.pdfIn PDF document text
    • http://falerisztika.hu/tmp/46489741416.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/59796705679.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/81829565379.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/wujezatixujoropewazinetux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=prove+that+the+sides+opposite+to+equal+angles+of+a+triangle+are+equalPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 16224 bytes
SHA-256: d1ff55f592c4bcea43ccd85b360c3187e32f6098a5c2e755fcb085bc62ff939f
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 17180 bytes
SHA-256: 3a6b06796d205359c1de60b63817802ed3d339c410737d851384e584e1d9b6e5
font_03_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 11092 bytes
SHA-256: cd6d5cd6db54cda17c94260f9b162c79e477f19136c976b5823f4876c40409b1