Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8118d5c03c846f7…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 08:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: db223e14d03323e5a503c7d0c43023a1 SHA-1: 9953e86dd772cd2a38cf63e4f4667e78f4d36062 SHA-256: a8118d5c03c846f7355dbb0ee644ddb45edcaaf83a63f33aa3b015e1d82e6c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer number of distinct hosts suggest an attempt to distribute malicious links across various compromised or disposable websites. While no scripts were directly extracted, the presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://allytemp.ru/uplcv?utm_term=muscles+between+ribs PDF link annotation
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/39258682005.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///nupakuxavuwadakedomimebo.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/wenusubazod.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ea314f19c1da0ee25a140cdb6a0b0688/sakixaximojolitunofe.pdfIn PDF document text
    • https://mytopics.it/uploads/file/94742757914.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g3nt2diulr5prqo3rs0c4mhfd9/96002946724.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/09c6e6bbcc703b7a93017594e9b9ed47/10951671219.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070768a857e3---bogizutixuboporeze.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/jolati.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/tusatekipofoxofuva.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c86875dc6---15752635451.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddec96a32e0---59708804530.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ced45ed9ebf1a2a51fbf3313f3b33dc3/lolerezuvezawamik.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/40434805888.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eecf52dd35---wuvavawewetebu.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/8drp5ivs4ksv56jv3dp5o4rk3s/vofefemukabagituz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960bd6551---72329000841.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ab76bbda49c7c10bf808a6795211e0c5/87048524756.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160983a2aa34e9---genofakab.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/lizititanovutidex.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/76752115109.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab627f626e4---pamim.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b38ecfe4a---18692058401.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e08f0501---ketelojelarumojajoguva.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/96b832a32384768189341c28354ecbc7/fanipedipofusotaja.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/sexewanovov.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6677378eae---23010091733.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 10260 bytes
SHA-256: 1f3b64ae8ab0b39cf085ab014de9cc7bceafe37b81ce7d5b87a16449773c2d74
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 16472 bytes
SHA-256: 96d6b1f1e970f0576baab5ad9fb9e2529c1f70e129211dd3dfe21333ca29aba9

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