Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7819886eef1ff9b…

MALICIOUS

PDF

83.1 KB Created: 2021-06-15 13:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cff59fccb1808cc1f81e756cf8fb80e3 SHA-1: 03c0edcb455aadcd2601baa32c86e3a3218b0829 SHA-256: c7819886eef1ff9b7df7ad9ec3c5308576978947db968b7f819e27d5a0bb7fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://crysiq.ru/uplcv?utm_term=attack+on+titan+english+dub+voice+actors PDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/926014786c559274d0b41c76fe1c806b/salezovomopifofopabogazab.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/jinat.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/beninetemapazurofix.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/41674530751.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/726bb359d6e947159711ff7f944a009c/rovutekeza.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080136d138e5---58679905031.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/nuzibi.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/linozibol.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91d81d405---xorarapifetexoxiwukuf.pdfIn PDF document text
    • https://coluer.ir/documents/file/fekuwuvonow.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/45413403270.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16075c32bc1166---58084933766.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bdbaada8---5689280803.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2572c1bb6dbff7f0d15f8a74417d9e40/jofipop.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/turumupusosikowoziv.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vcpnea449a0rbrmfdecjpns6mo/56276234401.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/somoxupilonupopugagovaz.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/058fde73ecdbee2fd2485392fc7c9a5b/91991593835.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jumaximuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 4120 bytes
SHA-256: 03eeafd9f3f3cb3c1d547ed97ffb4a36788d803c3cee82d2c5954144e6774ea9
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 5452 bytes
SHA-256: 51c4d501a786a18e767e46c28c0826364e863ee2e85897041515f38a30af1b4e
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 1972 bytes
SHA-256: cf0d8fb5527eae19401dfc12654250517e7a38e3cc95ac791bee53c0147e1778
font_03_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 11624 bytes
SHA-256: b30e60c4d360f5310a1db4ae3a876cf7d3222d335cdee35f49f95989c52d82f3

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