Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55ccc499ec816a4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 11:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52bddaa48233278b2787f3f0af54f462 SHA-1: 3ce8d83585db5796efee0bdff592784caac15ee4 SHA-256: c55ccc499ec816a4e3d135fd75c17c4d0f5e00dc27433163112f71b33dd6515d
96 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 storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://crewmak.ru/uplcv?utm_term=todas+las+leches+vegetales+pdf PDF link annotation
    • http://mestav.sk/uploaded_images/file/nojitonovivivadazejov.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/jufitazepejojaxejono.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107260846358860.pdfIn PDF document text
    • https://kede.org/userfiles/file/52642302624.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/90294424400.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b6b793f293a63c854802c227ae7f581/58084818548.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db2c301ad---goxibegepalu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b4f02fae509dcb69a6af9de21e9157f2/zajoxu.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/lofokuniwuzoxugagegudexu.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d847b99e6471efa58cb6212867ba08ff/xemujonimuviwo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/ravujevene.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///lewefosigapupalava.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/nonulebivibobilimin.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210809_26E43B847A9EC20D.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zinokojizuvewibadabaz.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dimamebadunubidulirog.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/zububufufevezo.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/crddv9l8hp9nkc9fq5s3n05g32/31319342788.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpd5q103jr3jep28tovrok3lp6/52586057479.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/35106192953.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/63986894336.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/539f6722e736c808fcea3fa863e8a19c/3369294023.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/wekigu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b45a3f1f333---poduvizijezizover.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nesodi.pdfIn PDF document text
    • http://fygl.net/uploads/file/300020005782.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994f3f2a5b9---9054494988.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_off0000b57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 10632 bytes
SHA-256: f578d3b5e6c0f6ccc3cf6de6d38bd5d62b1688bbca4865124317ebbbe2c11a3d
font_01_sfnt_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 15392 bytes
SHA-256: 4d2abc3310f42c5ff94bd31bde9af9e5348517cc95dd6b09b4c8b84f541deebe
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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