Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0263fcd67312379…

MALICIOUS

PDF

87.8 KB Created: 2021-07-23 22:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8245f2691886c14f6c84ab4d1e93a81 SHA-1: e7643e170b417e351252a186c5f395cd72a903af SHA-256: f0263fcd67312379d81e39ab3163bea45fc4b631b20ab87cfb47803573ccb842
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b34bc1bdc---mogizilibokilopo.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/molh357ik8mj178se83nt140b0/25061037794.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r9o02m54u39q0vf1itvgu702pp/panimovijiwuwobuze.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa58b3925---23105802526.pdf
    • http://nowyhotelik.pl/userfiles/file/30391886624.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8522363fc---48514201954.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607454be08f5c---gowesadiriwarexese.pdf
    • http://geoplan.su/userfiles/file/56594629548.pdf
    • https://seerupit.dk/assens/file/domedelidadoguwujutev.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78be52297c---liligerebaru.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db9a7932387---vadov.pdf
    • https://aspit.ro/imagini_ws/44288576598.pdf
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/34522172123.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/405cc26f879d711a13b8cdc9b42a4674/laden.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/b73ijvkphmc23801kjstmh4ct0/37515942036.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/60685730654.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bd6a4b1d92b0e624dea40ae266d8c298/parupolakela.pdf
    • http://acrclubinversores.com/files/galeria/files/puganenunogunarakev.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8ca71ee3---pedamifexelu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1498914ce1---wafufeximufabuj.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/70t7hmerf7046dl2rik473isb3/61094622608.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607920d16af86---toxejikupi.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ca6eee9d---78193334483.pdf
    • http://laclonghotel.vn/upload/files/nonapur.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607649d0a0d90---82589430444.pdf
    • http://reicar.dk/userfiles/file/munivoguwidisebelagutusi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=le+royaume+de+kensuk%C3%A9+r%C3%A9sum%C3%A9+chapitre+8
    • 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_off0000ea0a.bin
40f54c338bdbf70a13932455c051441bdda6d1461e1ae3f352f924a16320f408
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 19748 bytes
font_01_sfnt_off00011b86.bin
8b5861789b9b7a9841932fdec8234fd6e5e8edc4391b32dec4a017bc50b25d36
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 11356 bytes
font_02_sfnt_off000135d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 16792 bytes