Malicious PDF — malware analysis report

Static analysis result for SHA-256 178eb95af04023f2…

MALICIOUS

PDF

74.6 KB Created: 2021-07-01 20:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f989f6afb2be52873f30469e7db6767 SHA-1: 5e8fa7a419c95ae2243a357e04f061c898c1ccd7 SHA-256: 178eb95af04023f25d983a247787d8efb284eb48e33023b9a08e479fd01fb2b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript or exploit vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=dc+machines+notes PDF link annotation
    • https://fokusmedia.com/images/uploads/76862674749.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/jasof.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5dda21f2b0ff01f5d33b73debd682d19/68010881419.pdfIn PDF document text
    • https://jurad.eu/files/file/36475542999.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/dd36d904c18286befe542e0020e9b5a8/15909289279.pdfIn PDF document text
    • http://bscartridge.com/pic/14743031935.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501230227412620.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/532c411840569e10a91bddcbb241e52d/bekapuxar.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d91bf05d35---pogixijefebofitupamubot.pdfIn PDF document text
    • http://sam-global.info/files/file/gobawisiv.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/14e08d050f360c76074ee428529d3184/ritivavezaxibewep.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/giriwabaxapuwagimegune.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607408149cd60---xawewujisijojot.pdfIn PDF document text
    • https://flyags.com/editorResources/file///dopekapurubuv.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/130829771cc01267e99784e2fb007fd4/sefefavozusukopoxamov.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/foxefetid.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/480d46695cb46ddeca47478929750d3a/4733022053.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/441641ee298eeff013a69985f083da5a/kujabarixuronumo.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/85682823632.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f4831b444---93513652161.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7b100bcc---busipoveditaro.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/epoujf0q0icnvdlsp61kji3hlq/famijusukurejemitagexuvo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1c4e9b68---mamod.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f466db76d---61220435967.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076278a2f888---kegakuvifugo.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/27500788984.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_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 16660 bytes
SHA-256: f998a1069a332d96110068134e7eb41da6b35a24b97f2e97e910d1dfd35ee9f4
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10348 bytes
SHA-256: 904f8f104904a6846cddd5a0623a742aefce010a513d722a4ce11283d02472b9
font_02_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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