Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8ace4c4d7889a6…

MALICIOUS

PDF

86.6 KB Created: 2021-07-18 17:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54fa55a6b26dd6e703ea497cc18cd58b SHA-1: fb20f1d9eb5cead022631c2b502fdd603d44dfd3 SHA-256: 9c8ace4c4d7889a63c57628c0ade237b58f97d965023e8f2d753b83e966e9631
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories and other sites that host further PDFs, suggesting a phishing or malware distribution scheme. The presence of multiple compromised CMS upload links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://csc021.com/userfiles/file/20210629015801_bvrh73.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbc6f0c0c---dederawi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/68b38c0eb8c005f7c106da7b50da542f/58857774649.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3aea4857---forasopexole.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894bc74edbe---66103857507.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cdfb53a44---47556820962.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/poguwizixamipomesujafano.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a989f83c---81778100803.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nodunixariliwep.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929da03b75c---8382431186.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/37019771645.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051020521090182.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/10682cf3e4015ccb161115e02bef0563/xuzazezewusawoge.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3231bc17---dipazepakimulagomivikene.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/69817293142.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/16599971995.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b9ous9t0ls75erj7ouqn6366ab/24382007899.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6eju14sabgkc6b2j4bp4b7cjen/wafogisokuxusolo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9403c956---19601095648.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/19943669473.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/oa6l4p9p8soh905idbn34gbeuv/sizinoxizifezi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089af533e887---48913651471.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • https://invest.pl/userfiles/file/govuti.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add1c3bf04d---lopumalajalulexewufuvu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094811559036---37057128452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tongue+tie+clippingPDF 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_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 17224 bytes
SHA-256: 73b1c2425ab6b98f848d2efad22ab56378ea2a96210ee5f6aa9532c478acdde7
font_01_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 10180 bytes
SHA-256: 01823f1feaf1f1b12866af145c2ede675bd0bce04fe485481b2f8cf518d6e776
font_02_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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