Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa4976907fa96c7…

MALICIOUS

PDF

80.1 KB Created: 2021-08-05 06:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4db5cc17500706f26d8ba037a06c32a7 SHA-1: 943710bd46f7bef5eac043702cb07862971cb86f SHA-256: bfa4976907fa96c76a4b96d59de71f74ff296727704506b9bdf9eca31910dbb0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations used for hosting PDF files. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent.

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891cbcda04a---98299794856.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6348c89542---70972359063.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d0abb417---lefunawigo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a7d27ee81155012f25f585958241d147/46213986673.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090be8335d2c---61974349442.pdfIn PDF document text
    • http://gabortech.com/admin/file/29282241498.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/44660211848.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/46068392313.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6c27333b69318852a90b52f19e3e6321/54484916127.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a2cf18b1f---megilitivosi.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/midexowe.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/5431022089.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/unpc8oa7nthprh3g0jgts4q7p2/72436572178.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc1b4d8b6---kuvizidexulapinu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dec4f33bae3---tudimekasalagedivifoturo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8mfg7jiuci68dkj7enleou8ug5/2012910414.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///laxupolexotaroxejogexanuf.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/36336774678.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/73e126f99e1845f6ebc94a0f293da145/83261087769.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/11e556bd0ca9bd811e116e1e329dd220/1199208783.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/gujodok.pdfIn PDF document text
    • http://ciskmv.com/css/file/72832492124.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/50qimm1u0tfq5e49581sl87r25/96804844725.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/miq1kgj3ou003tlvj3hkpcmq94/86262394973.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/besijog.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/706a6536d6d350cbdd801c65faa68005/nunedokodasalirafok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kis+kisko+pyaar+karoon+full+hd+movie+download+openloadPDF 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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 17132 bytes
SHA-256: 1b077168c1c27355dd3c682b23eff202c10f90754aef8e6f631c0547374fc120
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 11112 bytes
SHA-256: 5d4182e565d7621a9b8a2a743886aefa25cc44d7a6256826308c227239084567