Malicious PDF — malware analysis report

Static analysis result for SHA-256 6837f8c741a77d41…

MALICIOUS

PDF

92.2 KB Created: 2021-07-14 07:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e395a0d7b403287cba12422bf29f214c SHA-1: 076dcd02f3e888c7c3f939b76cbd88c1235735a1 SHA-256: 6837f8c741a77d41d24e31f7e92278fac930f7f8887202ac63a4112bbf5acc95
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to potentially malicious content, supports the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=how+do+you+invite+friends+to+minecraft PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096c96a1e019---dewarikoposepupuzawozaz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/44s3emhs7b21ddd2evkq2sa8pd/xovenokepixidebi.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/tudizugubezonum.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/d97shhjek7cm24tklpgk09qin6/51861554848.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a01d218dff9e5cab03f9850724bdac93/kikufapifura.pdfIn PDF document text
    • http://armanetti.com/images/1841726099.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/48852393776.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6431a7f6---48889454716.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/93714502763.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdefc1b62c---777299870.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/14f3a82d83bd27e3eb84f82892bd9827/zonumiroxazafutiravesowi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zavenetimifamiroti.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc8a8d3f---kibokivunilepitinovolu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608928155565d---71693180807.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430120402586042.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/37143074d91c2cd164e5f45cb61d5fa8/36216770923.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/87378395412.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/71923629508.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/538ac8da95ffacbc3fd5052fcc4a2456/nutip.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f31ee5334---64647205482.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/81766950893.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/34a155a09edf66d3d5850c4cf0c77e94/vepijezeku.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/76117150297.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5256898cda---24012765698.pdfIn PDF document text
    • 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_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 17884 bytes
SHA-256: 3c5bf412f6f5796daa85ee2db03ddae809cec485fe2a0c98d803e77cfb069c6e
font_02_sfnt_off000149e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E7 10948 bytes
SHA-256: bd4c7a4c7592f6253eebebed7324eadefe10f721297b7ae352cd5937dc3d5001

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