Malicious PDF — malware analysis report

Static analysis result for SHA-256 7422ce6e0ff90586…

MALICIOUS

PDF

78.5 KB Created: 2021-08-03 18:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adc4406a759f05227cb6c0b1a84917da SHA-1: cd20f0c7d7b062f10449b70a0f4757e30c89332c SHA-256: 7422ce6e0ff90586f719f33d608cbdc759d26252c87d19306d405486fd27e75f
96 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to domains flagged as disposable or potentially compromised CMS upload storage. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to external sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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://anhuizhkj.com/upload_fck/file/2021-7-10/20210710131400456130.pdf In PDF document text
    • https://tipresentoio.it/images/file/wobujokonapogelizuba.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7ad4ca53---zutekemuvuziruradelinuze.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/17697064860.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/baroxomoguxoborigesan.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/zotanozufuborijesus.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/xotuvanerejikusoji.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50beb0b402---pifomibunemomuxav.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210709223133.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vejamugujepojonajadib.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/darazafebewamazima.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/30462786018.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/senurafisu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/48541683160.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5147e8626---65209770987.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d384e5a36---kelinukunagewotodifoge.pdfIn PDF document text
    • http://rentaruedas.com/files/others/25353895600.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/50658050923.pdfIn PDF document text
    • https://binhvi.com/upload/files/benaki.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609f62bcda08d---63130694982.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/gevuruzupuzavoluboloz.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/9390667747.pdfIn PDF document text
    • https://preciseenergygroup.com/media/86216890321.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/fobudiwim.pdfIn PDF document text
    • http://apcmagon.com/userfiles/26169098510.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/gugaradoxulox.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/23838694083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=teoria+y+dise%C3%B1o+organizacional+richard+daft+bibliografiaPDF 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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 11236 bytes
SHA-256: 9e8ceaa3709b2e3f379dfd24353cebbc99cc7c763e97ddf7a0595fcce951a9ad
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 17312 bytes
SHA-256: dc3461169e7d39c5cae3852fd8b6bee17730f7654efe74a59e6592d06a503270
font_02_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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