Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b48bf09731f60…

MALICIOUS

PDF

90.6 KB Created: 2021-07-27 23:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56e17fcd384148692c1d548e374d8ab1 SHA-1: 278b5a36aa16e4cd90679cfd87bbf886e1dd5c5b SHA-256: dc0b48bf09731f608fb9d4aef108e85df3f62af97aad2ebd892bb2f0d52e5736
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bhandarisurgical.com/ckfinder/userfiles/files/37801419180.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/524665748.pdf
    • http://e-skala.pl/userfiles/file/dasukadutev.pdf
    • http://driver-jazda.pl/upload/file/10799237561.pdf
    • https://fnb-concepts.com/images/uploads/files/janavevebawokozo.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7c9964kufphls5142qsc2nlrp9/lebipimapepevitabixab.pdf
    • http://uniroll.pl/user_images/file/tujalabuxijapijip.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b60145ab42b---32570477414.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210702_8650615562EFA397.pdf
    • http://enotecagaribaldi.it/userfiles/files/novuderorenenagalobat.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eb26a532---nabufakev.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rsp609uhrdfcunmie6man20l58/domeliluxiwogoxodefikebo.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/998d0ace44923fd68e11b6995b83da30/57680375584.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fcbca022---57164738736.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/1288368727.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086513c87117---82900547921.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c3364a0ef6c---wikukisajuw.pdf
    • http://moscowprice.com/content/xuploadimages/file/puxizojupef.pdf
    • https://farmstead.tw/farmstead/upload/files/fubagubul.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c69a9bc1c397fcfa41b8d23884e59070/36578338746.pdf
    • https://tomas-music.com/contents//files/84727259588.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2e57q0lb8bpf3d0fa89fr4irlc/26113250966.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v2a58dblko8o3vmqfgfusahr36/xejug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=igi+2+android+apk+obb
    • 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_off0000f3c5.bin
76fa95dcbdbc75c879c41520067a2c0050979bcc72d831dde66d64564f0dd019
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 23300 bytes
font_01_sfnt_off00012cd0.bin
c2b6fb8a2554db20bb472d15f4c0f1d72f770298f9b605b2fa616778d0411e28
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 10428 bytes
font_02_sfnt_off00014417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 16792 bytes