Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c996719236c0840…

MALICIOUS

PDF

84.0 KB Created: 2021-08-17 01:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92cd6908ffddec4107ba946df7908a5c SHA-1: 1fdf82672df834c01ada9fc0aeb00f708e4533d8 SHA-256: 3c996719236c0840988196167ddf85f8def38ad882b0e67e48a0e532af97f247
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No specific script functionality was clearly discernible due to potential obfuscation, but the overall pattern points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/008tgvpb6j31trjidfb1s97edr/zixurexuxiv.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e5b71a08---sobarozolit.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/15467017810.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97fb341c5---tariburaxisisakavijopumo.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/929b2548b0d724beb635a47dfb4225be/70515271343.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ajkhoaku23ul2jie47o6c74m0j/77123523143.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b3ff163d---6558777299.pdf
    • https://amatnieks.com/pictures/image/muwazebemododanufekepakin.pdf
    • https://nevisnews.com/userfiles/warijezapirorekibolupu.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430234510611442.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/k2e5gl88vvroro12lluaugnmp3/divodawijenuwi.pdf
    • https://happycolaborativo.com/uploads/files/35130867449.pdf
    • http://altiro.nl/home/tjerk/file/vakozirejimefofab.pdf
    • http://hongquangled.com/upload/files/76514630538.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/1465297007.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb038f69a4a---renonudozojoludigewajos.pdf
    • https://ortechindustries.ca/ci/userfiles/files/birodanorugukawuxebek.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a230de433---49737516767.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/zutatigafiv.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/tivofodosamu.pdf
    • http://regcureguide.com/files/files/37483467596.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bc44691e0779712395f4b40c48db5644/voxutujixekofo.pdf
    • https://towa-aaa.jp/userfiles/file/87382968656.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51d05f409---pobixivesaguledulobeted.pdf
    • http://mixline.ru/img/lib/file/najipabisolalogin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=why+is+my+hp+deskjet+2130+printing+blank+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 16792 bytes
font_01_sfnt_off0000fa94.bin
0607040dced540738026db2271b83895c8ec0f280dc7a80f94e8abdecb312460
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 16868 bytes
font_02_sfnt_off00012699.bin
6b69f2c1a666a7333f810ab1bc8657659c697aa7443b168dddfb0095f4907514
pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 11656 bytes