Malicious PDF — malware analysis report

Static analysis result for SHA-256 f948fd7605a31823…

MALICIOUS

PDF

103.9 KB Created: 2021-07-20 05:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dda8e2698bd75474f88cca8f210d37d2 SHA-1: 8bb35f3ac3250ba914d5c4f46129ac79a706ea89 SHA-256: f948fd7605a318234406a5e4a79ecff6633bdb4ca07d389233aa314dc994d769
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised websites or domains associated with link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The presence of numerous external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://otelm4b.ru/admin/ckfinder/userfiles/files/ropelezudoderumugul.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609896a96426e---xikodilavojaxepojat.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/kurivenomerikulivipofu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071929ca86b9---zadever.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/378f1b9ac9f296224f3a790852a8230a/12485340459.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/zaluf.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zepumajukixorupoz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b7b93e61---19879518877.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fee504890---masawalopapemu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a67258df4f6---89659888870.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63e924dba---8543083125.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f8e0fee5---posirowotaxakofexet.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/7195188395.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caacad1386---32459069520.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/14923166880.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e7f66ac6---42375805099.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/tifasagafibikanoj.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315a90f886---nirosupofakenifa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bff367d4c---fewopival.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a17599b5a44f963d1dbe25ea53fb663b/wenepefewunepewadow.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a767389d54---getelasosu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c4041864363ae051a4d0bcde27b1a1eb/damokizidiwigibonab.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a66f7f68bcb9c80d4cfdfcdf1bc1e183/kinunozonabam.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/51047779237.pdfIn PDF document text
    • https://reniuved.it/file/77825844536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+agriculture+website+templatesPDF link annotation
    • 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_off00013529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 16920 bytes
SHA-256: 31c2919159298c44c19e4330923013c38372fdda626c06352ad18737f226f4ed
font_02_sfnt_off00017951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17951 10796 bytes
SHA-256: e787a05f570ae014cd555355c6281d049c7b423c5c25a4ac0164fd79a91d4bf7