Malicious PDF — malware analysis report

Static analysis result for SHA-256 5828161e3c049f54…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 04:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df7b2b0f8b6602f1eab8bc4c41e4575e SHA-1: aed3111b665745f3e45972afc222bfdd44cfac3e SHA-256: 5828161e3c049f548b448429de2814b61d4bf2414e5daa8d9da3789a5ad68da2
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple external links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hotel-la-licorne.fr/userfiles/file/jomalokaruxuvavino.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/57212075612.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6e53e218a---batuzuxalajewedovujula.pdf
    • https://majubesar.org/contents//files/26696517486.pdf
    • https://badoza.net/userfiles/file/97474454850.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ed584adbcd4fce467f022b5bf20a1605/suwuluvibaworisuduxoti.pdf
    • http://forter.vn/hinhanh/file/nemovumajo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160793afd52c43---85706374928.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f1b9cebd2f9409199f231b144c9beecf/rubepotudip.pdf
    • http://dostavkaturov.ru/files/file/97225224396.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/47708734860.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c6023f09---45310962565.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084939317bc5---16216039750.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mc7s7rtqa46340j3g5n4kn4tvv/nomenamolakurexifugifil.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/fepadapigavo.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58a07f0c7b---4956031907.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb86ae4070---51720672721.pdf
    • http://lucann.com/Upload/file/38525129387.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/prbml367dq8odcaipt4ca0jkof/telubevuvekararuforajiku.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/10106811398.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ab7bebd---38884318939.pdf
    • http://nhs1968.com/clients/65482/File/wifudawiriz.pdf
    • http://thedreams.cz/files/60498042599.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc87c09aea---96545789648.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/bcdb95921cb49839153ad4e20b07a214/18668893327.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=separate+list+with+semicolon
    • 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_off0000ec82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
font_01_sfnt_off00010499.bin
ea3b2af4451015ea10978ef9249e8524c593c6171ad34371e6ed2f02df4a0816
pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10800 bytes
font_02_sfnt_off00011d53.bin
6ef090722d5307aca49245919903560fd6bc2f21a6dcea95c7789299adfa064e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 17384 bytes