Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf0442b64d3b2b7…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 16:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59fee6490e7fb8afea35316f447bfa0b SHA-1: 3388113cdeb0cb3a68eae97ea20b6c654a9e9769 SHA-256: dcf0442b64d3b2b744059e2c4ca7db269694d36e3f12cc1fdfc03944de4010a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://acavacecio.it/userfiles/files/tasizanibu.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4203d359dc46d4f35ba418149e6ffc1d/jokupexuvejal.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9urcdmqj2l2kkui7d2m7fqdb14/94317853180.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4aeb6f214faafee6c3adeee449117c90/42775269201.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0aejv8bgkbfa4r71qicc6n7uut/buguvedumovo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e73fef948---zivifebi.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210610070054.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b445cc7e---mokegesumifa.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9acfb773daad477a0a3cc3bdeebf7b61/61023595211.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c987a685bcb---90330204464.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff159ce9b---zonagonujebo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d242b4b51---volabapexanineverozejile.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bff69e70d---xirivo.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/213c820749c1a9e35beea84e12f3ec63/pukiluwikebikuw.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/48ac7888ab503c1125694ffdb6640c09/letopefupepirisek.pdf
    • http://jrpst.pl/userfiles/file/14081907418.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kdudaujdnb7e6n15uum27iqsj3/23981734092.pdf
    • http://akinmedical.com/uploads/file/memalajoz.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075197b3930b---kewapolepivupurazoxexufa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1d2055439baa9fbfb5f4d61dea126f7d/dofomigesasisitotikoruj.pdf
    • https://lotteppta.com/beta/assets/file/povupawujixazuxiz.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68d489755---movajugokog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=windows+scan+to+pdf+multiple+pages
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin
b6744b52a823c6e0caec6b019a394156cca920341963d9a1e29782b3509c409c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 1700 bytes
font_01_sfnt_off0000f72c.bin
b1780ba577dda9f819f6f2e0790d5a71ac07a1388d44a91e1d0fe667e0fa0cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 11040 bytes
font_02_sfnt_off000110b8.bin
f289bb124ea550c68610be181f0a2bbef2aaeb59eb2bfc4f0281f27a05877ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16928 bytes
font_03_sfnt_off00013cc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC0 16792 bytes

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