Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5cfa9db5f92274…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 18:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13d3c0fd9e8b246b5ca715fd32496fe5 SHA-1: cf512aa4b5d90208a702407c73685be93ab38636 SHA-256: 9c5cfa9db5f92274c47d11ff32568ea4cc2c298abe4f5cc27e05fc23a8f4db7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or scamming operation, likely using the embedded links to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is weaponized to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=saw+5+full+movie+123movies PDF link annotation
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/riberofuzezutefajewoj.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zonimiluwisefu.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/silupana.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210912_9BF05E3F3CCDFEC7.pdfIn PDF document text
    • http://telecycling.org/files/file/79185788270.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/18377390114.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f1251afd0109e589c4adcc564f622845/nenumaxoxoxob.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/dejuletavamimurereji.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/60048390737.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456d075d20a---gevedikubudubew.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/13936861490.pdfIn PDF document text
    • http://generaldistco.com/images/file/44310157125.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/86435356654.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jexajalus.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900532833c---99508778696.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091419072173.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/40674023332.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/13797383319.pdfIn PDF document text
    • https://aitalk.vn/upload/files/84193259183.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/nixawogudofopom.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/93807875929.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecf5779fbd---92271489621.pdfIn PDF document text
    • https://loctra.net/userfiles/file/4356102296.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/rajobexatug.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_off0000b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E5 15624 bytes
SHA-256: d35f584ba7076ddcb992602f0f25e956ed0a30a1113329696941c3c3eaf5a0db
font_01_sfnt_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 10880 bytes
SHA-256: 43f97332650911f71a0f4bf26e3259cac2c545f216078ee7d68b57ffa3944430
font_02_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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